Quicksilver Plugin for Plazes
From rukapedia
The Quicksilver Plugin for Plazes reproduces some of the functionality of the Mac Plazer: you can use it to check in and out of Plazes using Quicksilver (if you have a Mac and you don't use Quicksilver, it's worth your time to take a look).
The plug-in does not reproduce the "see my friends status" functions of the Plazer -- it's only an "update my status" tool.