Helpful tools that get overlooked/forgotten

[lincpimp]

A body reamer is a very handy tool. Dynamite makes the best I have seen.

Dental pic set is also very handy.

Not sure if these are "tools" but I have a nice set of cylinder shaped brushes (like giant pipe cleaners) in nylon, brass and stainless steel. They come in very handy for cleaning stuff.

Tamiya make anti scratch channel lock-like pliers. Those have come in handy more than once.