available if you want to test it you can get a download via TECHNET SUBSCRIPTION.
Of course you can't use the technet download in a commercial organisation - but for developers etc who want experience in using etc etc then a technet subscription ~250 - 300 USD is a NO BRAINER IMO.
Also good for HOME users who want to learn about installing and using Servers.
If you look for promo codes you can probably get a discount too on your technet subscription.
Incidentally Students *might* be able to get a free or cheap version of W2008 Server too - same conditions not for commercial use of course.
Note the download from Technet doesn't have an expiry unlike the Free Trial download and you can use several copies.