All to often I hit one of the hot keys that surounds the movement keys. This a big problem in World of Warcraft when flying high on mount and hitting any action key that causes the toon to unmount.
So, what are good things to use to help identify keys with out looking down at the keys? I want to be able to identify the standard WASD movement keys without looking. It must be something applied to the key itself and can be removed easily without leaving a residue behind. Also, not looking for an add-on or 3rd party application, if one exist, to resolve this issue.