The complete Popotan, with official subs, on divided into two Mpeg-3 video files. The sound quality is high, but for reasons of download convenience, I have ripped the video at a slightly lower bitrate. It is, however, perfectly watchable.
Episodes 1-8 are in file 1, and 9-12 in file 2. If you wish to burn these to DVD, I would suggest putting in chapter breaks on your DVD-creation software. Nero makes a good one.