You could probably game on it with some of the older games. With over 1GB of RAM, WindowBlinds should be no problem. It's just that you get a handful of background apps like that running all the time, and then you decide to pop in a game or do some photo editing, and you'll get some lag.
Best thing to do if you intend to do intense stuff like that is to create another admin account where only bare bones essentials are set to run.
Set all extranious programs and background apps in the "Pretty" account to run just for that user.
Many programs, upon installation, will give you that choice; Install for you, or for everyone.
Perhaps someone can say how to limit the installed programs to certain users?
I know it can be done pretty easily, but I forget how.