Dattebayo have got fansubs of ピタゴラ, available free to download as
BitTorrents. They're great, you can hear the Japanese and relate it straight to the subtitles at the bottom - as it's a children's show, they tend to speak slowly, and repeat things a few times.
I'm a big fan of the 'otōsan suicchi' they have at the end of the episodes!