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 [...]

Popularity: 11% [?]

Hunting for places to check your links, check the value of your links, check out your competitors, etc…
As always feel free to add more resources in the comments.
Reciprocal Link Check (Reciprocal Link Checker) - check whether your link partners are linking back to your website
Link Popularity Checker (LinkWorth | LinkQuote - Text Link Quote) - [...]

Popularity: 9% [?]

If your paranoid and don’t want to install the google toolbar - or seoforfirefox.  Here are some other places to check page rank……. or if you want to see your future PR:
Rank Checker (Ranking Tool) - Get a overview of your website’s ranking
PageRank Lookup (PageRank Lookup - SEO Tools - Search Engine Optimization, Google Optimization) [...]

Popularity: 10% [?]

Let’s say for my little example here that you have a website that sells sporting goods.  Things like exercise machines, footballs, those silly socks soccer players play, etc..
Your domain is something like:  Greatsportgoods.com  (from this point on we will call this your ‘main domain’)
You’ve got thousands of products, and of course you don’t have the [...]

Popularity: 22% [?]