You can use a whip as a grappling hook.
Prerequisites: Use Rope 5 ranks, proficiency with the whip.
Benefit: You can use a whip as a makeshift grappling hook, lashing it around a protrusion or other firm, weight-bearing object in order to climb a wall or swing across a chasm. You make Climb checks using the whip as if it were a normal rope. Using this feat requires a Use Rope check as normal for securing a grappling hook but takes only a move action.
Source: Complete Scoundrel, page 90.