You can use the wiki Coworking Visa. It hasn't gotten much exposure from new spaces in the last two years, but the older coworking spaces that know about have really taken advantage of it. In Denver, we've had people from Office Nomads, Next Space, and an individual from LA use it in the last two weeks.You can also invite your members to Loosecubes and use their network as well. They have really started to gain some traction in Denver and we've hosted several people from around the US in the last month.
Craig Creative Density Denver, CO -- Visit this forum on the web at http://discuss.coworking.com