This is the carrier I have for Scooter, and I LOVE it:
Karen's For People + Pets dog carrier - eBay (item 140218178965 end time Mar-30-08 13:48:02 PDT)
He loves it to~It has mesh on the sides for ventilation, and the two pockets on front are so handy! There's also a leash clip for safety...
What are some of ya'lls fave carriers?