Certain apps' fonts look like **** (gtk apps).

[caf4926]

Just thought it worth a mention. On my main box running F10 which has Gnome and kde4 I have different settings than my screen earlier (from my laptop which is suse and only kde4.2)

F10 looks better with the same fonts (liberation)
But anti-aliasing = system settings
DPI= Disabled

Maybe worth a try.

[sexyclient]

I have those settings, and the font rendering still isn't quite uniform, but after upgrading to KDE 4.2 they've come quite closer to each other. I have hinting on "slight" and the fonts for GTK apps are only a little thicker than their KDE counterparts - which is much better behavior than before, I'm satisfied with this though so everything's cool now! KDE 4.2 is great, can't wait for 4.3 support!

[Dexter1979]

Out of curiosity what settings have you in GTK Styles and Fonts?

[caf4926]

I don't think you were asking me, but:
Default - For me that is Use kde in gtk