Just finished downloading the new iPhone OS beta SDK, and there's some great stuff in 3.2 that will pay off in a big way for Downloader. USB connectivity for sure.
Interestingly, Apple says these pieces are only on iPad, but I'm sure by the time the next iPhone OS comes out (and is the focus of an Apple event), the important pieces will be on your phone.
P.S. Downloader 1.40 was submitted this past weekend, hope to see that online soon.