Here's something that might be helpful:
Podcast Alley's page for the old podcast. It contains the titles, old URLs, file sizes, and dates of all files in the old podcast. Note that the dates are only the dates that the files were added to the podcast, not necessarily the dates they originally aired.
I cross-referenced this data with the titles of all of the available 2006 podcasts (from 272 to 879), to come up with the date that each of these files was added. From there, we might be able to figure out when everything originally aired.
Here's a spreadsheet with the URLs, titles and date-added for the podcasts. There are quite a few gaps in the date-added column -- the only ones with a date listed are those where the title matched exactly. Feel free to edit in any more dates.
I also went through all of the "Best of" podcasts, and figured out the date they originally aired (
spreadsheet). Adding these to the podcasts already at hamishandandyarchive.com, we now have 52 "best of" podcasts.
Something else worth noting - eight of the podcasts are actually video podcasts (mp4 files).