This is one of those Basic SEO posts, that i feel silly writing about because "everybody knows" this information already. But then I look at websites of prospects and I realize that not everybody really does know. Or maybe they do and they just forget. In any case, this will be a quick reminder / refresher.
Most duplicate content issues have to do with on-page content. Mass page/content duplication can often have a negative effect on how the search engines spider and index your site. While I believe the title tag is the single most important piece of real estate on your site, duplication here is likely to have the least effect on the search engine crawlers. Even still, it's a duplicate issue that absolutely must be addressed for tactical SEO performance.
Duplicate titles is something we often see on newly developed websites or content management systems that don't allow proper control of individual pages. While I get how, when developing new websites, the title tag can get overlooked, I'm still amazed that many internet savvy software developers still don't take title tag customization into account.

In some cases it's just a matter of some creative programming to fix. In others it might require some significant reworking of the system, or a scraping of the system altogether. And, of course, other times it's just a matter of taking the time to get into your HTML or your CMS and writing unique title tags for all your products and content pages. If you have a lot of products or pages, this can be time consuming, but it's well worth the effort.
If you can pull it off with your CMS, allow Titles to be automatically generated based on on-page criteria, but also give yourself the opportunity to overwrite the defaults with your own customization. This is especially handy for product pages. The default can display essentially the breadcrumb trail of categories down to the products as the default. This will ensure all your title tags are unique, to a degree. But at some point you may want to get in and create a unique title tag for more punch and better search engine rankings. Having both options will give you the greatest degree of control without having duplicate titles until you get around to customizing them.

Do whatever you need to do to make your title tags unique. And by unique, I mean, not tied to any other element on the web page such as the header or breadcrumb trail.
Having unique titles on every page is great, but not if they are always identical to the your page's headers and breadcrumbs. This just creates a different form of duplication.
There are some cases when it makes sense to have your Title tag and H1 tag in very close alignment. Typically this is done in blogs or other informational articles. But I still recommend keeping an element of control that will allow you to change them to be unique whenever it makes sense to do so.
All said and done, your titles should:
This article is part of a series on duplicate content. Follow the links below to read more:

Writing attractive and unique titles can be a pain, but just like you said. It's well worth the effort.
Since I'm writing on my blog post by post, it's kind of hard to have duplicate titles but still, I keep checking google's webmaster tools to see if there are any errors.
Yeah, duplicate titles on blogs usually isn't a concern, but it is for e-commerce sites with lots of products, etc. Heck, I've even seen it with 20-page sites fresh out of development, all the title's say "welcome"!. It's just something to keep an eye out for. Thanks for your comment MrCooker!
Dups in titles and description tags should be a concern. I have seen great pages suffer on ecommerce and larger websites because of it. Google uses the title attribute and description tag as a duplication identifier.
Jaan, I agree completely that they should be a concern. I didn't mean to imply otherwise. In terms of ranking I think duplicate title tags can be a problem. I'm not convinced, or at least I've not seen evidence, that dupe title tags will play a significant role in pages being dropped from the index, if the content on the pages is unique. If you have experience otherwise, please let me know.
Never seen them dropped from the index, but surely not ranking to their fullest potential. I have taken on many clients in the condition of duplicate titles/description and simply made them unique and seen an enormous jump in rankings.
Unique titles make an incredible difference. We've set up a great CMS that creates good Titles for a client. She owns an IT recruitment agency and adds new jobs whenever she gets any, within a few days Googe will have indexed it. Have a look at the jobs section and the individual job pages - www.baobabcon.co.za, the site design is not my favorite, clients choice... ;-)
Euro Character Printing and Exporting to Adobe PDF Issue update
This archive contains an updated version of the PostScript procset used by Adobe PageMaker. The updated version resolves a problem that customers encounter when printing the Euro currency character to a PostScript printer or when exporting to Adobe Portable Document Format. Without this update, the Euro currency character is substituted with a bullet when printing to PostScript printers or exporting to Adobe PDF.
The updated P65ps.ps file correctly handles the mapping of the Euro Currency symbol glyph required for PostScript printing and exporting to Adobe PDF. This update allows the Euro currency character to be printed correctly on PostScript printers and to be exported to Adobe PDF.
Yea, I've heard about the 65 char. limit.

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