My main oblivion character has acrobatics, athletics, blades, illusion, sneaking, security, and speechcraft with a focus on speed and agility and the thief as his sign. I keep the other skills leveled up though as a lot of that stuff is surviving a dungeon 101 stuff. I also appreciate how leveling up and leveling skills is kept separate. You actually see progress from doing things related to the skill rather than dumping points in every level like in Fallout 3. I might never use a heavy weapon in that game, but I could have a skill of 100, wtf?