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Wordtracker is an online keyword analysis service designed to help web site owners with SEO by identifying keywords and phrases that are relevant to their business.

Quoted: Use Wordtracker to discover the best keywords for your website.

If you need to publish several rss at one or several digest, this is a great tool. You can mixed several source (rss, html, jpg, atom and many more), choose your output (javascript, html, picture, and a lot), personalize your template, and publish on several system.

Quoted: Professional service that blends and converts RSS and Atom feeds to other formats for publishing

Great database resource. I love read a comic books, and this site have a complete profile for most a popular heros.

Feedcombine is another tool that re-mixes feeds.
New features include much shorter bookmarkable URLs which should tidy things up a bit.

This is a relatively simple merge service that combines any number of feeds into a single merged result. There is no ability to sort or filter. Input may be done by directly entering feed URLs or an OPML file.

BlogSieve is a web-based tool that allows anyone to filter, merge, sort and strip groups of feeds into a new feed in the format of your liking.
You have great features like filtering, merging (up to 5 feeds), stripping and sorting.

A dream for many people is a software that sync all your principal information, without duplicate or miss any. May be a live mesh do it.