Hmmmm looks like there might be a new kid on the block (pun intended).
Looks like IBM has unleashed a new crawler named SAI-CRAWLER. Just found it in one of my client sites log files from IP 129.34.20.17 -- grabbed the robots.txt and a single page and left. It might be nice to see an old established heavy hitter like them throw their hat into the ring and level the playing field a bit. Maybe something to look forward to.