Well I'd never come across a soundblog before, so here's the Harsmedia Soundblog. Click the streams on the left bar for audio samples. Harsmedia are a co-operative of digital artists who are working with found cassette tape. This is the Found Tape Exhibition. Part of what they do is mash up the castaway sounds they find. These files are podcasted. And here's Nick Brendon (from US sitcom Kitchen Confidential) with a rather less ambitious audioblog project.