you probably already know this, and/or not interested, but canon does make this small unit that would substitute for a pop-op nicely.
small, inexpensive, will 'bounce', has 2 focal lengths, compatible with e-ttl.
would work in a pinch and much less obtrusive to lug around town.
http://www.bhphotovideo.com/c/product/616667-USA/Canon_3806B002_Speedlite_270EX_Flash.html

"I guess I'll just have to start packing my flashes even for daytime shooting."

you'll learn to love it!

Last edited by Barnacle; 05/24/09 11:12 AM. Reason: forgot the lnk