Every time I go into a bike shop or look online it seems I have everything, or at least everything that I want AND can afford.
But occasionally I run across something new that I really like and sometimes a few things that I don't like.
VERY GOOD:
CO2 Inflator. Sure saved a lot of pumping when I had a few flats last summer.
Terry Fly for the Cure saddle.
VERY COMFORTABLE
Quik Stik Tire Changer. We use these at the bike shop and I finally broke down and spent $3(?) and bought one.
NOT SO GOOD:
Polar Insulated Water Bottle.
It is much harder to squeeze than the older bottles like these.
Continental GP4000S. Not as good as the GP3000 or the GP4000. Harder to mount and I had 3 flats on them this past summer. I had 1 flat per season with GP3000 and GP4000.