I love, love, love paper crafts. It is my passion. There are a lot of great places on the web to find templates, demos, techniques, project ideas, and project instructions. These sites should keep you busy for a little while
ArtChix Studios--Free Classes
Cut Out & Keep--Crafters community
Go Make Something (requires registration, but it is free and there is no spamming)
HGTV-Paper and Cardboard Crafts
HGTV--Rubber Stamping
Mirkwood Designs--Templates
Paper Crafts Magazine--Projects
About.com--Stamping Projects
About.com--Stamping Techniques and Tutorials
About.com--Stamping Templates
Stamper's Sampler's Tempting Templates
Split Coast Stampers--Resources (They also have forums and galleries but some of those areas require registration. Registration is free and there is no spam.)
DIY Paper Crafts Projects (There is some crossover here between DIY and HGTV projects, but there are some different projects on each site, too.)
Stampin Inspriations by Maria (This is a personal blog, but it is updated pretty frequently. Her stuff is a little cutesy for me, but she has some great ideas for card layouts and techniques.)
I'm probably forgetting some great ones, but these should get you started. Enjoy!