I honestly don't use IDE's all too much anymore. I started out using them but I've found myself sort of decomposing into doing everything manually via terminal (which are exactly what IDE's are designed to keep you from doing). I just don't like the meta cruft that gets added to your directories by using IDE's.

However I voted for Eclipse simply because of it's versatility and the fact that it's the second IDE I've ever used. The first was MSVS 6 where I was rocking the tried-and-true Visual Basic 6. Now, I just feel dirty writing anything in Basic.

EMACS because vim isn't listed

Eclipse is the best!

vi + gcc

+1

Geany is looking like a nice balance 'twixt usability, footprint, etc. The one I typically use, however, would be Bluefish. But that is only because I have been on Gnome DE since converting to OpenSolaris (yeah, but it was sweet while it lasted). I've been using Emacs more and more though so Bluefish is already beginning to fade into the distance....

This really should be two sections as you don't need (or often want) a fully blown IDE for web dev

For me it would be:
IDE: Eclipse
Web-development: vi or Kate.

Emacs +1

Bluefish.

I voted for Bluefish. I have been really impressed with the quality of the new series.

Emaaaaaaacs!

This seams to be the year everybodt starts to mention Qt Creator. So that´s where my vote has gone. Still exploring the thing though.

I was torn between Netbeans and Bluefish, went with Netbeans in the end as I really like 7.1

Eclipse is ok. I am using it with android and python integration..

Eclipse is good.

Although I use mostly vim for editing, I find Geany a good choice when I work on projects with many files. Geany is not resource hungry and does not have tons of dependencies.