Over the weekend Documents to Go v3 for OS 6.0 devices leaked but some people seem to have issues installing it. From what I can tell you must remove your current version of Documents to Go before installing this leaked version since it will just duplicate itself. It also only works with OS 6.0 devices so no luck for older OS users.
The thing is that this leak seems to include the full premium version of Documents to Go for free! Now that RIM owns all the DataViz assets in that field that would be the logical move. Robert let us know that this leaked version also includes the Repligo PDF Reader 2 (called PDF to Go) for free which would be even cooler. It would also nicely fit with the PlayBook which RIM has not stated if Documents to go will be free.