The Ruger LCP & LC9 have been selling like hotcakes recently. In fact, the LC9 was named handgun of the year by multiple industry resources in 2011. These handy little pistols can be purchased with the LaserMax Centerfire laser or the Centerfire may be added to the firearm later as an upgrade. They attach securely around the trigger guard and have an on/off switch which is toggled by pushing a pin from either direction.
Lasermax makes laser sights for a variety of firearms and has recently released internal guide rod lasers for the Gen 4 G26 & G27. They also intend to add a few more Gen 4 Glock models to their lineup this year.