Using Flip4Mac I found that CNN, Reuters and Sky worked well. The BBC will not let me look at their stuff without a subscription and Channel 4 promises QuickTime but fails to deliver.
This is not really a MS or Apple problem. The main problem lies with the website designers failing to grasp what it is that they need to do or those that don't grasp the concept of using W3W compatible code.
MSNBC expects you to use IE 6.0 which, even if there was support for WMP, would rule you out anyway. No IE for Mac after v5.0. This lack of support for WMP on the Mac is not a new thing. Compare the difference in version numbers on both platforms.
The ultimate choice is yours. If you cannot live without your daily does of WMP provided news, which is available in other places, then go for the PC.
You are asking questions that no one on this forum, has the answers to.
When MS and Apple signed a new deal for Office, they nuked any future upgrades of WMP for mac. There's supposed to be a plug-in/download/whatever flip4mac to run wmv files with no problems in Quicktime. It doesn't. I mailed flip4mac who say a month or so to sort out the Quicktime compatibility issue.
BUT there's no guarantee that media sites which all stream video and audio using WMP will be mac-compatible when WMP is next upgraded by MS (soon? with Vista?). Many may well be Windows only. WMP is used exclusively by British media like Sky News, Channel 4 News, BBC News - although some of their's is in RM for the moment - plus CNN, Reuters etc etc. I want to go to a site, click on a video/audio link and have it open and play, not convert files to other formats or smash machines/my head in frustration! I need the media sites. I like the G5. But would I be sensible to stick with a PC?