Now that Windows Live OneCare is slated to go free how about bundling it with WHS as a Power Pack 2 release ??? If client PCs dont have any Anti Virus Software installed it could give the user an option to push OneCare to clients. Anything that doesnt have a self limiting factor is of the devil.
More like Windows Live OneCare is being replaced with a product currently still codenamed "Morro", which will be free. It will, however, still be a single computer malware product. If people want it, it's a trivial process to get it. I don't think the WHS could add any value (in either direction) by bundling it and creating a whole set of WHS interfaces just to supply AV on client PCs.
But still, you can always make a product suggestion on Connect. I'm not on the WHS team, I just post a lot. :)