Caroline Jarrett has been writing about forms for a number of years. In her column on Usabilitynews.com and her site Forms That Work. Here's a small sampling of some of her extensive writings on the subject of forms:

• Designing usable forms: the three-layer model of the form (pdf format, 172Kb)
• Should I use a drop-down? Four steps for choosing form elements on the Web (pdf format, 58Kb)
• Two-column Forms are best Avoided (March 2006)
• Colons at the end of labels? (May 2006)
• Long Forms: Scroll or Tab? (April 2005)

Caroline has agreed to lend her expertise to my upcoming book and will be writing a "perspective" on putting people before pixels when designing Web forms. Really looking forward to Caroline's insight!