I'm sorry, if it wasn't jail broken and you don't have SHSH blobs saved for the 4.x.x you want, then your pretty much stuck at 3.2 or if you update it will be 5.01, but I'm sure the USA today app has been passed on iOS 5.
Just checked, it seems to be running fine on iOS 5.....up to you whether you update or not. It's always a big choice! It can be jail broken too at 5.01 although it's tethered I think.