Diving into the world of Tcl/Tk

Trying to pick up GUI programming for Tcl/Tk to add in my work.
Here is a quick reference
http://www.pythonware.com/library/tkinter/introduction/

Web Security

I am starting into the new area of web security and here are some of the resources that I have found. Stay tune for more interesting site on web security

Burp Suite
WebScarab
ProxyStrike
W3af
IBM Rational AppScan