I do a lot of web development.  Unfortunetely at work all the folks out on the floor have Internet Exploder oops I mean Explorer.  So I do most of my testing in IE6.  The problem comes in as we start to do more DHMTL (AJAX) on our sites.  Ofter you need to view source to see what is rendered.  Well of course IE just gives you little old notepad and calls it good.  Firefox does a better job by at least highlighting syntax.  Well, I've found a good solution for IE.

Notepad++.  Two big bonuses here.  Excellant syntax highlighting and code folding.  Code folding is the ability to expand and contract sections of code so it's out of your way when you don't want to look at it.  The syntax hightlighting is great plus Notepad++ is one great editor in general.  I use it for heavy duty JavaScript development because of the code folding and the lings that line up the beginning and ending tags and code blocks. 

Give it a try.  http://notepad-plus.sourceforge.net/uk/site.htm

I believe it promts you on the install to act as the view source client for IE.