Illegal.
steal
Theres one I think geek that does this.
http://www.thinkgeek.com/gadgets/security/c49f/it's illegal, ok, thats why they sale one on thinkgeek.
And I don't get keyloggers, Do they steal chat? and If they steal passwords and stuff, how does it give it to you? Some one elaborate for me please.
Can you get around them by using an on-screen keyboard?