Just as a more informative and contructive post - I thought I would try and pin down some of the use cases where the Music player stutters IN MY CASE.

Note : I have latest PR1.1 update applied
Am using stock media player
Starting the N900 from a clean boot as a test case
started the Media player as the first app
Have around 200+ songs stored in SD card
SD card has 603 MB available (out of 4GB)

1) I start the web browser without connecting to Wifi or 3G - web browser starts connecting to 3G (as no Wifi availeble in test case scenario) - since its connecting in background with white browser window as my main screen - music start stuttering seriously.
I check 3G strength - its 2.5G actually.

2) Browsing smoothly now and listening to music - over 3.5G (some regions have spotty 3G with T-Mobile) - no stuttering.
I open Goole.com - tap the cursor on the search bar - the onscreen keyboard pops up - music stops for a second and resumes.

2nd time I tap on the search bar and on-screen keyboard comes on - nothing - no stuttering - 3rd time, 4th time - nothing. Seems only on first time when the OSK daemon (or process) is loaded for first time only ... this happens

3) From first window of browser, I click a link to open another window (on Talk.maemo.org) - as secon window starts loading a quick stutter.

4) I open conversations window - and refresh my GTalk conversations (via the One Ring I presume) - stuttering of music. Browser is still on.

These are some of the test cases I juct checked quickly ... its not a deal breaker - but its an issue. You cant say "oh, its NOT an issue at all" - is my point.