Podcasts are really well-suited to mobile devices; is there a better way to run than with Ira Glass discussing Argentinian basket makers? But podcasts have a place on traditional computers, too. Most people rely on iTunes to manage their audio and video subscriptions, but Vemedio thinks it has a better way. The company has ported its popular iOS app to the Mac with a public beta of Instacast (Free), which eliminates iTunes’ bloat in favor of…