I've seen plenty of apps to customize SMS but nothing on e-mail. Ideally, I'd like it to just vibrate when I get e-mail. I'd also like to have certain SMS tones when certain people text me. I keep my phone in my bag while I'm biking and I like to know how many e-mail I get, who's ringing me, and who's texting me. That way I don't have to stop each time someone tries to get me.