A lot of users want a iChat skin on their IM clients. Most of them use trillian but trillian is a resource hog IMO. The other alternative , pidgin , is free is easily skinnable .
:: pidgin 2.0.2 with Glossy P skin with transparency
:: windows XP with an OS X VS [ there are tons , find one you like ]
:: Avafind - search tool
:: Y'z dock - dock