I've only recently upgraded from 2000 Pro to XP Pro, and now Server 2003 and i've been seriously missing this feature, too. Here is the solution, in case you haven't figured it out yet, and for those to follow.
"The common tasks pane lacks a player for sound and movie files in the search results, but you'll find this feature in another Explorer Bar. Choose View,Explorer Bar, Media, or press Alt-V followed by E and M. Select a movie or sound file that Windows Media Player supports, and click the Play button. For a larger view of movie files, click the icon on the right above the progress bar. Resize this undocked version by dragging the edges, and redock it by clicking either the icon above the progress bar or the Close box in the upper-right corner of the player. You will have to click the Stop button when the file has finished playing to keep the Media bar from automatically playing the next file in the search results list."
from this article
I hope you're as happy as i am.
*but each time you reopen the folder, you must reopen the media bar. oh, well....
"The common tasks pane lacks a player for sound and movie files in the search results, but you'll find this feature in another Explorer Bar. Choose View,Explorer Bar, Media, or press Alt-V followed by E and M. Select a movie or sound file that Windows Media Player supports, and click the Play button. For a larger view of movie files, click the icon on the right above the progress bar. Resize this undocked version by dragging the edges, and redock it by clicking either the icon above the progress bar or the Close box in the upper-right corner of the player. You will have to click the Stop button when the file has finished playing to keep the Media bar from automatically playing the next file in the search results list."
from this article
I hope you're as happy as i am.
*but each time you reopen the folder, you must reopen the media bar. oh, well....