Memory is the only hardware difference that matters. Everything else is the same, with the exception of the 8330 having a camera and the 8830 having Euro GSM capabilities.
i was going to get the 8830 from sprint but then they announced the 8330 was coming out..I thought about it and I use camera phones alot just for those in the moment pics. ..man i cant wait till the 25 to get my device activated..i dont want to get prorated lol
Only one person pointed out that one major difference (well, "major" to people who travel) is that the 8830 is also GSM capable, meaning that you can use it when travelling to places that don't support CDMA.