Nothing is worse than taking what you think is the most fantastic photo you can imagine, and getting home, loading it on your PC, and it’s either a little soft, or out and out blurry. Some of these articles have duplicated tips, but each has some unique suggestions that will help you achieve sharper and clearer images.
Digital Photography School shows some basic reasons that photos are not sharp, and the solutions that will fix those mistakes.
http://digital-photography-school.com/how-to-take-sharp-digital-images
Some more basic tips from Photography Life. This includes 17 tips for improving sharpness in your photos. Some of these are the same as the Digital Photography School, but there are other interesting tips here as well.
http://photographylife.com/how-to-take-sharp-photos
Another article from Digital Photography School explains the hyperfocal distance concept. This
http://digital-photography-school.com/the-secret-to-ultra-sharp-photos
If you’ve read through the articles above, you’ve seen a tripod mentioned a couple times now. What if you forget your tripod? This Photojojo article has a really cool tip for improvising a tripod using string and a pencil.
http://content.photojojo.com/tips/how-to-get-sharp-photos/
And finally, an article from PhotographyMad.com that includes some interesting tips, including turning Vibration Reduction to OFF in some cases, using your mirror lockup, and turning image stabilization back ON for other instances.
http://www.photographymad.com/pages/view/17-tips-for-taking-tack-sharp-photos
Hopefully you have found some of these tips helpful. Happy shooting!