Cameron Marlowe suspects that Blogdex is being gamed. The jury is still out but there's a bigger issue. These ad hoc ranking services, which are often touted as reliable meausrements of blogosphere popularity, have the same problems as Google, with 1/1000th the staff.
The genie's out of the bottle now. How far can Blogdex, Technorati, Daypop, et.al. be trusted?