When selecting proper keywords for your page, Live.com and Yahoo! can be of great assistance. Both sites have a great suggesting option of potential keyword phrases.
When dealing with Yahoo, notice the blue stripe that shows related terms to the term in search:
Pay attention, because it contains many terms hidden behind arrows. On the right side of MSN Live you have related searches:
As you can see on these examples, MSN and Yahoo! Can be a very sourceful when doing research on combination of keywords.