Update - Rented a Tiger from Dubbelju.com
Well, I can whole-heartedly recommend
Dubbelju Motorcycle Rentals (Dubbelju is pronounced like the letter "W"). After contacting several rental businesses in the bay area on the same day as I intended to rent, Dubbleju had a good selection of bikes, was located just off the Bay Bridge in San Francisco and, most importantly, provided AWESOME customer service and a bike that we in tip top shape and ready to go!
I decided on the Triumph Tiger, partially on the recommendation of James of Dubbleju, and it was a great bike for the 120 or so miles that I managed to squeeze in while visiting. The bike was very UJM in ergos and they included a hard top case and saddlebags that came in very handy. The Tiger is a 3 cylinder, although it sounds almost electric, and it had plenty of power for my needs. More importantly, it was more than nimble and offered excellent ergos for my passenger. T/he suspension was a bit /squishy/soft for two up but was great for solo riding. All in all, a good all around bike.
Prices ain't cheap. List price for the rental was $169/day and net price worked out to $185 (using my own insurance). Lowest list price anywhere that I saw was about $145 for lower end bikes up to about $200/day for premium rides. Oh, and they all want a credit card for a $2500 deposit for the "just in case" potential of riding.
If ya ever need a rental in the Bay area, be sure to check out Dubbleju, ask for James or Cheri and you'll be in good hands!
Best of luck!
PS:
I did contact MotorcycleRentals.com and spoke with their man Jack. He was very helpful and I rec'd many recommendations from various riders, in fact he wound up recommending Dubbelju.com, but he simply couldn't make money by dropping a one day rental to the bay area from his SoCal location.
The only other option that really looked good was
Thunder Road Motorsports/US Motorcycle Rentals but their FJR was rented out.
I also contacted SportBikeRental.com just to be sure that they were truly "CLOSED for the SEASON" (in California?!?!?!?) as of 9/1/09...?!?!?!?!? They confirmed yet again, saying that the market didn't support the business in the area. Of course, the several other rental businesses kept telling me that they were heavily booked and that right now is a very busy time of year for them. I think SportBikeRental.com might be in some kind of financial trouble.