In addition to “being informed” by Citrix marketing department, I also signed up for Xenocode trial some year ago, although to then current products which included .NET related tools not the virtualization ones.
For this very reason I got announcement from them that they have launched something called Spoon, namely a technology and/or website to launch virtual applications from Internet. It’s a hosted service by Xenocode through which you can provide your own virtual applications [packaged with Xenocode's app virtualization, of course]. Based on quick look at their demo site, spoon.net, it requires some sort of plugin to be installed first which apparently does acceleration to startup process (5-10x faster based on the marketing email) compred to normal HTTP based downloading.
Btw, their spoon.net site lists sample apps for you or anyone to try out. As I very well know from running my own site of free virtual applications, you should be careful about if original vendors allow redistribution in modified form; spoon.net contains several commerical – but free – applications which I’m not all that sure vendor have given permissions to re-distribute in this manner..