There are many nice and usefull tools out there which help you generate keywords related to one you enter or generate domain names around your keyword.
Some good ones are:
- Wordtracker: Generates up to 100 related keywords for your starting keyword, excludes adult keywords: link
- Digitalpoint has a tol which alows you to enter a keyword, choose your traget market and then generates you a two list, one with the searches per day from Wordtracker, the other one with searches per day from Overture: link
- Keyworddiscovery offers a paid and a free service. They get there keyword from search statistics from over 180 search engines world wide, the output of the free one doesn’t look that nice, but you anyway only care about the content: link
- Vurr has an interesting tool, it’s more or less an Overture clone, however they use the leeked AOL search engin data from spring 2006, older data but if you don’t have a “trendy” website this could give you some hints: link
- Microsoft has a whole lot of tools including adWriter, which automatically generates text ads for an input URL, Acronym Resolution, Keyword Mutation Detection to detect frequent misspellings or alternative spellings, Search Funnels, and much more: link
- Google has a keyword variation tool as well as a site related keyword extractor from any give URL: link
- Webconfs have a keyword rich domain name suggestions tool, you enter a keyword, select the extensions you are interested in and you will be presented with a list domain names which include this keyword and it displays you if the domain is free to register or not: link
- Overture is one of the best known search engin keyword analyzers, enter a keyword and get the number of searches for this keyword as well as relevante keywords (based on Yahoo searches): link
- Keyword Discovery have a free alternative to Overture which has the data of 200 different search engins, so it gives you deeper output: link
I’m sure there are many more tools out there, feel free to write a comment with links to other tools.