Somewhat of a tangent to my previous topic, but I've recently discovered the awesome (perhaps cliched) idea to have an assassin priest/healer (either the actual Healer class, or cloistered cleric for a gestalt best progression). One of the points of this is a character that intently studies anatomy (heal-skill) to aide in his assassinations. One feat in mind is Surgical Precision, a homebrewed feat on the myth-weavers wiki which grants sneak attack die for heal skill ranks (1d6 at 4 ranks, 2d6 at 12, and 3d6 at 20). However, I vaguely remember a feat, that I believe was official 3.5 content but may have been homebrew, that gave a bonus to death attack or something else assassination related based off of your heal skill (either requiring it, or something like Surgical Precision).
Of course, anything else feat/skill/spell related that helps make heal even better for an assassin would also be appreciated.