The ground and transportation office regularly updates the contact information  as well as number of vehicles for pedicab, taxicab, limousine, charter bus, and horse carriage companies.
You can find their updated document here:
http://www.ci.austin.tx.us/publicworks/downloads/limoadd_5.8.08.pdf
In it you will find that there are currently: (as of May 8, 2008)
93 pedicabs
669 taxicabs
17 horse drawn carriages
118 limos
54 airport shuttle vans
81 chartered […]

Pedicab Drivers in Austin are a hard working group of men and women. We literally work our asses off. As far as I can tell none of us are getting rich. While many are doing well enough to get by just pedicabbing 3 or 4 nights a week, there is one […]