I've been keeping the Bot Survey updated monthly with current figures on the automated avatars that cruise around the Second Life grid, but this month I've updated the text and descriptions to better reflect analysis to date. Short version: many (but not all) roaming bots are basically surveying Second Life land; most are likely concerned with ownership and status information, while a few have more-specialised functions. They are certainly not stalking individuals.
There's also a pretty chart. See? Don't I always treat you right?