Latency

Users start percieving lag if RT latency 200ms - Citrix ICA - webminar https://event.webcasts.com/viewer/event.jsp?ei=1007158

Citrix VDI-in-a-box 5.1 is available

few days ago Citrix has released an upgrade for VDI-in-a-box 5.0. You can install 5.1 directly or upgrade from 5.0xx

Xen editions differences

XenDesktop editions:
http://www.citrix.com/English/ps2/products/subfeature.asp?contentID=2300383