What are we still doing in Lebanon?

Last Monday (25 June 2007), a car bomb killed 6 Unifil troops. For details please click here and here.
Almost a month after the clashes happened between Fatah Al Islam militants and the Lebanese army, they finally came to an end. All in all 300 militants were killed or wounded.
PM Sanioura accused Syria of sending arms to the Palestinian camps through the Syrian/Lebanese borders.
Huge worries about Lebanon due to the repetitive breach of the 1701 resolution especially with the arming continuing through the borders thus the borders being unsafe, creating more dangerous militants inside Lebanon.

All in all, what are we still doing in Lebanon?