We're quickly running out of space for the archives of sounds. In fact, we're over our limit right now and needed to remove old sounds from the site. As a result, all sounds from 2004 and the first two months of 2005 are now offline.
The good news is that they will be back soon. The plan at this point is to make a flash-based soundboard for playing the sounds and themes for all archived Sound of the Day podcasts. Hopefully this will be available by late June.
In the mean time, if you have a specific sound you would like to have brought back or e-mailed to you, just drop Steve a line.