Han pursueing the stormtroopers on the Death Star without being armed now makes me think of Anakin as well. It's so spontaneous. :-) They have this tendency on rushing into things without thinking too much.

Hm, just realized that the plan to rescue the chancellor in ROTS is even more impulsive than the plan to rescue Leia in ANH. "Next move? - Spring the trap." I mean how more detailed can you get. :-)
Seems as if Anakin's impulsiveness has rubbed off on Obi-Wan, too.