Let me know if I missed any.

Underdark rules, followed closely by Unhallowed.....

I've only played the game once at ConGames two years ago. It doesn't really interest me.

However, I have buckets of the miniatures. I use them in my table-top rpgs or my son and I stage mock battles with simple rules that I make up on the fly.

The new ruleset that is out is alot better than the old rules. The game is similar to Star Wars Miniatures in the rules mechanics. Try it out, you will have fun!

With the arrival of the 4e of D&D, I bet more people will pick up D&D minis to use for their game table.

I know that's something I'm considering even though I don't plan on playing the miniatures game on its own...

Which brings me to my second point, where can one find individual minis to buy? I don't want to go through a bunch of random sets if there's a more generic set somewhere else...

Thanks!

And at the very least, if you have children, they can use the miniatures in a diorama for school.

Though, using Aspect of Tiamat as Abraham Lincoln probably limits the grade to a B+...

I shopped around for a while. After local stores cut back on their individual pieces, I found a merchant on e-Bay that I have always had quality service from.
I buy a bunch of single common pieces from them as well as the occasional bulk lot.
http://stores.ebay.com/Avengers-Rule-Super-Store

Sweet! Thanks for that! :)