Right now the only one I participate in is Tuesday Thingers. I have looked at Booking Through Thursday, and want to start doing this one as well, but my last few Thursdays have been crazy. I think I even missed doing Tuesday Thingers last week!
I do Tuesday Thingers because I love the LT bloggers! I get great recommendations, sign up for wonderful contests, and generally just love the community. I think Tuesday Thingers is a great way for us all to stay connected!