The input actions and projects from the podcasts could be research this website, research this tool, test this tool, read this book, subscribe to this podcast, read this article etc. I could input between 10-15 projects/actions a day.
If you are not doing so already, you may also want to quickly id each of your input items at the start with "Site: davidco.com - what is gtd?" for all website research or "Tool: thinkingrock - what version avail?" for tools, etc. That may help you quickly locate entries of a similar nature. Alternately, you can id each entry by topic of the podcast, such as "widget coding (wc)" "widget marketing (wm)", etc. A quick search or just sorting alpha will just pull that up.