Fellow Runners: I Need Leg Muscle Stretch Recommendations...

I just finished week 4 of C25K. I think that running is affecting the general flexibility of my legs. I feel that my leg muscles are just a bit too tight on the average day, even off days. I have proper running shoes, drink plenty of water, etc.

What types of stretches should I be doing to loosen up my legs a bit?

I'm just looking for a few stretches that I can do at home in 5-10 minutes. Links or videos would be helpful also.

Thanks a bunch.