I just LOVE the BrickForge hand saw and would LOVE to see more tools along those lines to fill in gaps where TLG doesn't offer suitable tools
Hammer (TLG makes a few hammers but none are the sorts commonly used for woodworking or DIY, a claw hammer would be GREAT)
Screwdrivers (TLG makes one kind, I bet BrickForge could do better including other styles than just flat-head)
Paintbrush (the TLG paintbrush is great for artists, not so great for house painters or the like)
The new tool-pack from TLG (seen in this years Octan Racing truck) has given us a few nice new tools (like the adjustable wrench and socket wrench) but there are still plenty of parts that would be nice to see and I am sure there are plenty of others who would like to see more tools.