If you sometimes have problems selecting faces and the last tip doesn't take your fancy then maybe this will help.

If you goto Window --> Settings/Preferences --> Preferences and goto the 'Selection' tab and change 'Poloygon Selection' from 'Center' to 'Whole Face'.

What this will do is stop you having to search for those little blue boxes in the the center of the face and instead you can click anywhere on the face and select it.

Hope this helps