netmeg - 3:21 pm on Jan 9, 2009 (gmt 0)

I have an account for home and for work, and I frequently access them from the same computer and/or IP number.

Google looks for patterns of bad behavior. If you don't throw up any red flags, you'll probably be fine. Things that would be noticed would be large amounts of clicks coming from the computer or IP number, or a lot of linking between the sites in the two accounts. I suspect if the two accounts were serving ads on sites in the same theme, Google would probably take a hard look at that too (i.e if one account has a recipe site and the other account had a cookware site)