Plenty of places to find keywords, phrases, etc.  I’ve already told my views on wordze here often enough that I won’t mention them.  Here are some ways to check how your doing with your keywords, analyze them, etc..

Keyword Verification (Search Engine Placement Check – Marketleap Search Engine Verification Tool) – checks to see if your site is in the top three pages of a search engine result for a specific keyword
Keyword Density Analyser (Mark Horrell – Keyword density analyser) – another SEO tools for keywords
Keyword Cloud (Keyword Cloud – SEO Tools – Search Engine Optimization, Google Optimization) – a visual representation of keywords used on a website
Keyword Density (Keyword Density – SEO Tools – Search Engine Optimization, Google Optimization) – another SEO tool for checking keyword density
Keyword Difficulty Check (Keyword Difficulty Check – SEO Tools – Search Engine Optimization, Google Optimization) – see how difficult it would be to rank for specific keywords or phrases
Keyword Optimizer (Keyword Optimizer – SEO Tools – Search Engine Optimization, Google Optimization) – optimizer your keywords with this tool
Keyword Suggestion (Keyword Suggestion Tool) – Find related keywords matching your search