I had no idea there were quilting podcasts! Will check them all out. I too like to listen while I work, and find CBC and the BBC have incredibly good podcast selections, most available free on the iTunes store.
Some of my faves:
"Thirteen Minutes to the Moon"...I have listened to it twice! A great look at the first moon landing.
"History Hit" and its spin-offs "More than Just the Tudors" and "Warfare" (for WWII buffs)
"Quirks and Quarks" for science buffs
"Tapestry" more spiritual
"Now or Never" just all around fun and interesting
"The Doc Project" ditto
"Short Cuts" lovely little random bits