Comment Form Resizer
A tiny plugin to make the textarea of the comments form resizable. Requires WordPress version 2.0+ and works in all major browsers. Set the style for the resizing handle in commentform-resizer.php and the title in cmnt-resizer.js.
Standard WordPress quick and easy installation:
Download… unzip… upload to the plugins directory… activate.
May need a little fine-tunning of the css for the resizing handle to match your theme.