So I recently started getting into Guitar Hero. I joined a league too -- =p It's fun but hard work.
[Update: Got a better sense of how well I need to do to place near the top... =)]
[Update: 1/31/08 scores...]

Current goals:

Easy rank:
Scorehero rank: Top 5 (currently 1st)
Scorehero score: No more goals... (currently 9,408,694)
Star: FC (complete!)
Top 5: (complete!)

Medium rank:
Scorehero rank: Top 5 (currently 1st)
Scorehero score: No more goals... (currently 13,723,900)
Star: FC (complete!)
Top 5: (complete!)

Hard rank:
Scorehero rank: Top 50 (currently 17th)
Scorehero score: 19,500,000 (currently 19,411,177)
Star: FC (currently 55 down)
Top 50: (5 more to go)

Expert rank:
Scorehero rank: Top 500 (currently 536th)
Scorehero score: 18,000,000 (currently 17,819,866)
Star:
3* (1 more to go)
4* (8 more to go)
Top 500: (35 to go)