Inspired by Google's recent approach to form inputs, i've come up with my own (very simple) form styling. It's not meant to be anything special, but i would love to think you'll use this to base your input styling...
form input, form textarea { border: 1px solid #ddd; border-top: 1px solid #bbb; padding: 4px; font-size: 14px; color: #555; }
This creates something like this : (notice the slightly heavier line at the top of the field)