Hi !
Well i am facing a severe problem i want to use google ads in my forum but unable to find even a single "Mod" for MyBb help me out !
Where do you want to place them?
Well there is a nice plugin for ads after first post which can be used with adsense.
MyBB 1.2.x version and
MyBB 1.4 version
For standard use of adsense though you can just insert your adsense code into your templates.