Setting aside fair use questions, one thing to consider if you play music from your computer is the fan noise.

Just a heads-up to let people know that finally quiet computers are available. There are even computer cases out there designed to look like audio components, with equalizer displays and volume knobs (eg. TVC-103 Case).

(Canadian dollars)
One general low noise site: http://www.quietpc.ca/
One home audio site: http://www.totalvoicecontrol.com/HTPC.html

The advantage of plugging your audio collection into your computer is that it gives you so much flexability with playlists. The disadvantages...lots of 'em.

Anyway, it's something to keep in mind, when deciding whether to get your next computer from a big box store, or to get it custom made locally, choosing quiet components.