My personal favorite sanding tool though is the humble Emory Board (the disposable sticks you use to polish and finish fingernails). For the final bits of fret beveling and polishing they are invaluable! Also, you can cut them into slender splinters and sand tiny joins and crannies, plus they have both Rough (100 grit) and Smooth(250 grit) sides...
Yea those emery boards sure are handy, but the ultimate are those 4 sided foam emery boards? Perfect for fine sanding small crevices & fret work?
Excuse me, time to do some Online shopping... :D