A decent guide on things to consider/do when creating HTML email to avoid problems with all the different clients out there.
#html
Boxed CSS – Free CSS grids
Boxed CSS is a free website that offers you CSS grids : they are free to be downloaded and modified, without a linkback required.
Styling form controls with CSS, revisited | 456 Berea Street
Styling form controls with CSS, revisited | 456 Berea Street
Very detailed breakdown of styling options for all sorts of form elements.
Aptana: The Web IDE
Pretty slick, open source, cross-platform IDE for “Web2.0” stuff.
SourceForge.net: kses – PHP HTML/XHTML filter
SourceForge.net: kses – PHP HTML/XHTML filter
An (X)HTML filter written in PHP to strip out unwanted tags/elements etc – prevent XSS and other injection-attacks