It's a known fact that podcasts produced on a predictable basis enjoy a steadier listenership than podcasts that have sporadic gaps between episodes.
This tip ties in with longevity, but takes it one step further. Longevity deals with the availability of content and your desire to continue podcasting about it. Frequency deals with the predictable timing between shows.
Many podcasters experience "podfade" (a show just fading away....) because they've picked a show format that is just too heavy to maintain. We stopped producing the GNU/Linux User Show because of the format. The show was based on the model that each show would contain a tutorial or review on a Linux application. That worked great for 25 shows, but the last five became too time consuming to continue producing a weekly show. Pick a format that you can sustain.
technorati tags: podcasting