i am using multitexturing to put a detail texture on my terrain, and i WAS using glcolor3f to do the shading on my landscape when i wasnt using a detail texture. But now when i use multitexturing, the landscape isnt affected by glcolor3f... is that my mistake, or is that just a drawback of multitexturing?

no. it isn''t. but you shouldn''t be using glcolour3f etc, you should be using a colour array (preferably unsigned bytes)....

when you activate the texture unit, use glColorPointer to give gl the colours you want to use.

even if i am using glcolor3f, shouldnt it work? i just want to know why it doesnt work...

No, he told you why. Each texture unit you activate must be told what to do.