I'm doing a bunch of kw research on esoteric terms and I just have to say that the quality of suggestions in Bing are generally much better than Google. 

Before I go through the signup...you don't have to fund an account to get access, right?

Trying to remember... I don't *think* so.

No you don't have to fund an account.

Quite good isn't it!

I only use Bing to register client's websites, never tried this tool before.

I like the way it presents suggestions after giving you the numbers, G only gives suggestions after you put in a landing-page etc ...

Good call LM

Depending on the type of keywords I need I think one is more useful than the other.  Bing seems to tunnel down in more tightly related terms where it seems G's Keyword suggest gives more broad terms.

I'll just throw this here too: ubersuggest.org