Frustratingly I love a lot of IDM but don't know much about it. I've picked up random tracks rather than whole albums, although I did get this the other day which I thought was great:

Infinite Scale - Ad Infinitum - has some Youtube clips attached if you want to check it out.

An artist who I think is superb but appears to have vanished off the face of the earth is a guy called CiM. His Delsin and deFocus releases are particularly good.

In fact, just about anything off the deFocus label is wicked, and dead easy to get hold of as well. Some of the artists on there have recorded pretty extensively elsewhere - e.g. Lackluster, who is well worth checking out.

I think someone mentioned Ruxpin in an earlier post, I'd second that, his music is beautiful.

Ah, and this album is wicked as well - Mr Projectile - Sinking