The Lagoon is one of my favorite summer objects. It's a nice combination of open cluster and diffuse nebula. Click for a larger image.
Shot from the Heritage Park Observatory. Meade 10" LX200, f/6.3 focal reducer, Canon Digital Rebel XT @ ISO 800. 24 x 30 seconds unguided. Levels stretched in Photoshop.
A little blobby, but I'm pretty happy with this unguided shot.