Most of the sub-forums here have a "What did you just buy for your bike" thread. I didn't see one here so I thought I'd start one.
Mrs and I just picked up new saddles. A Terry Rosie for her and a WTB 'Speed' saddle for me.
We also ditched the cheapo suspended seatposts in favor of some rigid 4-bolt BMX posts. We haven't gone riding yet to see if the new posts will be too rigid but I'm hopeful they'll work out; we ride 2.3" tires so we've got a bit of cushion there. Replacing the cheapo suspended posts and comfort saddles shaved almost 4lbs off the bike! I also threw on a pair of cheapo aluminum bar ends on the captains bars for added hand positions.
What have you gotten for your tandem lately?