Adobe have made Flash Player 10 available, but unfortunately there’s still no support for 64-bit browsers, but then Silverlight 2 doesn’t have 64-bit support either.

If you’re looking to install Flash Player 10 on Presentation Server/XenApp, make sure you’ve got XenApp 5.0 for Windows Server 2008 first or hotfix PSE450R02W2K3028 for Presentation Server 4.5 Hotfix Rollup Pack 3 for XenApp 5.0 and Presentation Server 4.5 (x86 here and x64 here).

If it’s direct downloads you’re after for deployment in your organisation, the same direct download links work, just be sure to apply for a distribution license before-hand.