I think it's fine...You can't really see it if it's minimized...And if people are seeing this with your window open, then I think you have bigger things to worry about them seeing on this site than "Powered by Crinkles & Cuddles"
Just get Firefox, and download "Hidebad". Then if someone sneaks up on you, you can push alt+x(or whatever you set it to) and it automatically takes you to your homepage, and can can set to delete all internet history, cookies, recently closed tabs, etc.
Aaaah! I was expecting a big sprawling logo. I can't imagine this to be a serious problem. Even when minimised, I only see "ADISC.org - Powered". You get the adisc.org on every page so if someone sees it they might be asking questions anyway.
The best thing I like to use is Opera mouse gesture function. You can open a new tab by moving down with rightclick pressed. VERY quick for changing your page. You could also clutter your start bar up so much that you can see less text describing the task.
Or - right-click on the task bar -> Properties -> Select tick box for Auto-hide the task bar. Voila, nobody can see you're open tasks.