There seems to be a problem listening to podcast enclosures in Bloglines: the audio plays at a higher-than-normal speed. I discovered this when trying to listen to one of James Robertson's
Industry Misinterpretations podcasts recently. The problem is not restricted to Firefox; Opera too seems to be susceptible to this (let me check Konqueror: nope, Konqueror simply displays a link to the whole MP3 file, instead of the embedded Flash thing). I have contacted Bloglines about this.
Update: It looks to be a Flash Player issue. I received this email from Bloglines today (October 12):
Thanks for writing Bloglines regarding the podcast feature.
The Macromedia Flash player has a problem playing files that are encoded at a rate that is not a multiple of 11.025 kHz. This effect is sometimes called the “chipmunk” effect; in other words, the file is played at double speed. To avoid this, encode MP3’s at 11.025 kHz 22.050 kHz or 44.100 kHz.