There are multiple components on how you can get in on buys.
1st We have a number of CPA buys you can jump in anytime.
2nd You have to have a complete advertising survey and it has to have been updated within 90 days.
3rd You should be using our free stats service.
4th We have to have a advertiser willing to advertise in your show
A lot of variables but if you are doing 1-3 you stand a better chance of getting in a buy. We always look at shows in current buys first because we have a track record with the shows. We also look at your website, check your content, see how consistent you publish your podcast, see if you are doing the fundamentals correct. Example: Show notes that are more than a paragraph, links to content you talk about in your show, a easy to fine email address on your website. A voice mail caller hotline where people can call in to your show. We also look at those podcasters that are blogging on non podcast days this shows us you are keeping your audiences engaged at least 5 days a week.
Things that are negatives - only doing 1 show every two weeks, not releasing podcast on a set schedule, non branded websites, bad rss feeds or worse yet only having the itunes button on your page. Currently Zune Marketplace is seing huge subscription rates. Not having a standard RSS feed on your website that those using other applications can subscribe to.
This is just a few of the things we look at when considering offering a podcast an ad deal. If your doing those things correctly you can likely be counted on to execute the ad campaigns well.