Originally Posted by pedrojoper 
My method of choice is upsampling in camera raw (I shoot RAW exclusively). You mention freeware, if you don't have photoshop and don't shoot raw you should try Irfanview. It gives you a few upsampling methods to choose from...
I have recently found that I get good results using ACR, doing my edits, going to CS4, doing further edits as required, and then sharpening and downsampling again.
ACR Seems to do the trick so far, and I already own it so I'll stick with it.
