This is the best tool I've found so far for keyword research: http://www.google.com/sktool/#keywords click more filters to find the best keywords. Look for decent traffic, and decent suggested bid.
Very interesting. http://www.google.com/sktool/#keywords will get you one screen, and http://www.google.com/sktool/ will get you another, where "Website" is "required". A search on Google for "google keyword tool" will pop up the two main tools - #1 and #2. http://www.google.com/search?hl=en&q="google+keyword+tool" I have never noticed the second one before. Another tool to play with! . .
Also check out http://www.google.com/insights/search/# It's not always all about the money for keyword, think traffic and region as well These are two nice tools
No. You would get paid much less, as I explain here at the bottom of the page - http://www.vaughns-1-pagers.com/internet/top-paying-words.htm The bids in the Keyword Suggestion tools are suggested bids made by advertisers on the "Search Network", which only show ads on Google Search pages. AdSense publishers get paid from bids made on the "Content Network", which are typically much less. http://adwords.google.com/support/bin/answer.py?hl=en&answer=26507 . .