Straight as a laser line...

Some years ago I got this laser level (for free after rebate!) and I've used it for quilting ever since.  I use it to line up anything that's longer than my rulers.  It's not only handy, but has a really entertaining attribute: it can drive the cat bananas!  (Of course I make sure she can never see into the laser.)
The angle of the laser line swings so it can 'fine tuned' point down immediately, or adjusted to shoot across the room.  The gizmo even has a hole, so I can use a strong pin to attach it to my design wall.    
If I were to get a new one, I'd want one of those that shoots two lasers, at exactly 90º apart, like this:  Black & Decker BDL400S Bullseye Crosshair 90-Degree Auto Leveling Interior Line Laser  Then I'd really be square!
Now if someone could just teach me how to get that date off my pictures...