First off - I'm an IT guy - I've tried all the obvious and I've searched EE.
New Dell Optiplex 960, 3 GB RAM, tons of HDD space (SATA 7200RPM), cleaned out temp files, defragged drive. Uninstalled Flash and reinstalled. Have Comcast cable connection (did this on Fairpoint DSL too). XP Pro. Using AVG anti-virus only. Win firewall off. tried turning off just about everything with msconfig... ran hijackthis to make sure clean boot. page file is 4096. Tried firefox. Quicktime does it too.
I watched the performance monitor while streaming - only at 1-4%. I had continuous ping to yahoo.com while streaming to see if internet bottlenecking - nothing.
no pattern to stutter - sometimes can go 5 min with nothing on youtube, then a stutter. Other times it's within a minute...
Have stuttering audio on some sites.
cnn.com - no stutter
nbc.com - no stutter (watching SNL)
itunes podcast - no stutter
foxnews.com - stutter (barely)
youtube - stutter
yahoo.com - stutter
comcast.net - stutter