Google Docs

I use Google docs for a lot of documents but I've got a problem with it now.  I use iGoogle too and since I'm logged in to use igoogle on my media center pc, I give access to my documents to anyone else who's using my TV/Media Center  after I'm done.  I'd like to have two separate logins, or something to that effect... where I can keep my private documents to myself but allow other people at my house to use my igoogle account and such, or just not have to worry about forgetting to log out of iGoogle all the time, but also not have to log in to Google every time I use iGoogle.  Ya know...