Yep, matte photo paper. I use the Epson ones - Ultra Premium is thick like cardstock and the Premium is thinner. I use Epson cause I have an Epson printer.
I'm going to have to check out this double-sided stuff you all are talking about though. That would be very helpful for my hybrid DIY template projects! What are the brand names of those?
Heather, Epson makes a double sided matte - I think it's called presentation paper - it works well for calendars.