Well... snakes don't often get hurt a lot. But some things that have come in useful for us have been:
1) mineral oil (for unsticking tape from snake scales-- had to run out in the middle of the night for this one)
2) neosporin w/o pain reliever, for minor wounds
3) q-tips, for applying neosporin or cleaning wounds
4) digital gram scale, for keeping track of weight-- weight dropping is often the first sign of illness, so knowing your snakes weight is important!