The developers of DEVONthink have just issued an update on the status of the DEVONthink to Go 2 beta. The second sync mode reminds me slightly of Dropbox Project Infinite, with its on demand sync. Great for space-constrained devices.
The next betas are going to see the addition of a second sync mode. It downloads only the metadata at first and the actual documents on demand or automatically when needed. This will make it possible to take out even larger databases and leave the lion’s share of the data up to Dropbox or your WebDAV service.