We mentioned the ProOnGo Storm beta earlier this month and now the app is available for the 8900 Curve in beta. This is a free pubic beta during the trial period but I am not sure if it will remain so. Their pro version automatically recognizes the fields in your receipts and converts them into text for easy expenses.
It looks like they will only be supporting devices with 3.2 megapixel cameras so the next device will probably be the BlackBerry Tour when it is released.
8900 support was only in closed beta before but you can get to it using the link below: