If you're interested in marketing at the microISV level or just like listening to geeks trying to sound professional while talking over Skype, check out the latest installment of The Mac Developer Network Year One podcast hosted by Keith Alperin of Helium Foot Software:
Mac Software Business Year One Episode 3: Marketing
In addition to Keith, Steve "Scotty" Scott and Gus Mueller return for this third installment to discuss their marketing efforts and related microISV wisdom. Of course, I'm in the mix too (probably talking too much) but don't let that stop you from checking it out.
Also while you're there, make sure to join the The Mac Developer Network and support all the wonderful content that Scotty and his crew collect and produce for the Mac developer community. It's great stuff!