Portable undelete tool for NTFS volumes (quick and free)

It's been a while since I've had to do deleted file recovery from a machine, so I thought I'd post a short note based a recent conversation that I had with a friend of mine.  Incidentally, the last time I looked into this I  ended up using a Knoppix Linux Live CD.  But a quick search suggests... that the undelete business is alive and well.  So after trying a few disappointing tools, I found that Recuva met the need (it worked, it was portable, and it was free).  It did a fine job of quickly recovering most of the recently deleted files, but as expected - struggled on the ones that had been deleted a while ago (several weeks old).