I have an opportunity to upgrade my BB from the Nextel 7510 to the 7520. Currently all of our BB's are 7510's Since I am the sole support for the BB devices at my company, I want to be able to use my device as the guinea pig for any user requests. The question is: are there any major software differences between the two? (other that the spell checker) are there programs for the the 7520 that I can't use on the 7510?

So far, I have been really happy with the 7510 and other than the brighter screen on the 7520, I can't see that there are any really big differences.