Since my active days, when I visited this chapter on a trek cross country to Cali and then Mexico I've always kept up with them. I was sad to hear about their losing their charter, then very happy to hear they were re-colonized in 2004.
Anywho, through a contact in ASU's greek life offices I found out that as of Spring 2007 they have 87 members, and are doing GREAT.
There site:
http://www.sigmanu-asu.org/ (hasn't been updated in a while, but has a great house tour).