Take a look at Rypple too, they're a social performance tool Salesforce bought with a lot of ideas that were neat. You might be able to go pretty far with badgi

Take a look at Rypple too, they're a social performance tool Salesforce bought with a lot of ideas that were neat. You might be able to go pretty far with badging and achievements here. I'd think trying to "replace" a report card might work well.