Syncing worked once, now stalled, recently won't connect at all

At first I tried to upload about 600 songs to my Bold and it got to about 92 and then just stopped. I figured it might be related to the 100 song limit so I paid for the unlimited monthly songs thingy. I spent the last 2 or 3 days screwing around trying to get it to upload more songs or resync, or remove the existing songs and replace them or whatever but it refuses to achieve anything. The desktop app won't upload any songs, but more or less every six hours it logs Completed Uploads -> iTunes Library.

My SD card is not full, my phone has a perfectly working data connection.

Finally today the i2b app on my phone won't connect at all. It fails over the mobile network and wifi with the message "Service is currently unavailable. Please try again later"

Really, all in all it's been a very disappointing experience for an app that had so much promise.