Reddit mentions of New Complete Guide to Sewing

A great project is some sort of bag or another -- it gives you ample opportunity to practice some core sewing skills without the stress of "fitting" anything. A nice tote bag with properly bound seams, a closure (velcro, buttons, etc) and strap gives you some great experience (adding hardware to the strap, mixing materials, finishing seams, etc.)

Just a side note: if you know any photographers/videographers, I can pass on a great sandbag how-to. The project is simple to make, but includes a lot of what I just mentioned and will be VERY useful to them. Whenever I'm feeling bored and the sewing machine is in reach, I find myself whipping one together just to keep my skills keen.

Good luck!

EDIT: I have a book recommendation! When I was in my first year Costuming class in university, our professor -- a world renowned seamstress -- told us to go buy this!, referring to it as "The Sewing Bible." She was right, it's an AWESOME resource and very inexpensive. Have fun!

I really like the Reader's Digest Sewing book.

It's pretty in-depth on most sewing subjects, but focuses on garment construction.

If you're interested in housewares, I also recommend this book. It's sort of twee, though, so it may not be your cup of tea!