dstiles - 8:44 pm on Oct 4, 2011 (gmt 0)
I think you may have mis-read me there, macas. I have no problem with real yandex bots - they work well and seldom seem intrusive.
My point was that yandex has a lot of fragmented bot IPs: work out which are the real bot IPs and you should have no problem. Also, work out which User-Agents read for images and again there is no problem.
All of the large SE companies allow third party scrapers on their IP ranges. The secret is to not let them in whilst letting in the true SE bots.