I created a fairly basic inventory management script:

http://www.rohonline.net/char/inventory.php

It lets you equip items and armor and see your whole inventory at once. Little more work to do to make it handle dual-wielding. It's also a little slow, but with some more work I can make it lightning-fast. Let me know what you think!

In the near-ish future I'll probably adapt it to handle shops and storage rooms.