Goto Treo Software makes this great app that boosts the speaker/incoming call volume for my old treos. I haven't found any Android app that does this. Can anyone suggest an app that will do this or perhaps there's a developer out there working on one?
But for now i've heard of the "louder Volume Hack" as well, but no root yet on the Eris. Not really sure how much louder you can get our speaker without blowing it, I've heard a few people complain of blown speakers so.... be careful once Root access is given, dont be too quick to make your volume louder as you may just end up blowing a speaker.