MACSMILEY  FreeRuler is, uh, free.   
(Version 2.3)

PAT320  Nice application, crash a few times (An exception of class NilObjectExeption was not handled)

on my macbook CD1/tiger but very easy to use, that's the most important!

My wishes for the future:

Be able to magnet a window in the ruler's corner and

Be able to save rulers setting and switch between these settings.

Thanks  
(Version 2.3)

NATUZZONE  I've recently discovered Rulers and I think it's a great tool. It's the easiest way to measure everything is on the screen and take screenshots.

The interface is simple and cool. Rulers can be created and moved both thru drag and drop and shortcut (making adjustments more accurate).

I'm using it on a dual monitor configuration, with different size monitors, and it works perfectly.

There is also a Windows version available.  
(Version 2.2)

BILL CLINTON  Still doesn't work correctly with dual vertical monitors. Horizontal lines now display on the upper monitor but not the lower one. Vertical lines are the same: the line ends at the border between the two monitors, displaying on the top one but not the bottom one.  
(Version 2.2)

BILL CLINTON  This thing kind of goes belly up on my set-up--two monitors, one above the other. Vertical lines appear only on the upper monitor and horizontal lines don't appear at all.  
(Version 2.1)

PICON  I was using the previous version: 1.1.194 without problem. Then I updated to this version: 2.0.290.

On startup, this message appears: "Beta version expired: contact omnidea to receive a newer version (and it's no good to tamper your system date)."

Developer, please correct with the proper file to be downloaded. Otherwise, this is an excellent application.  
(Version 2.0.290)

GHOKIE  This looks like exactly what I've been needing... however, when downloaded from the developer's site and launched, there is a reference that the Beta version has expired.

Would love to try a working copy.  
(Version 2.0.290)

BILL CLINTON  This program does not work correctly with vertically-oriented monitors of unequal size. (I can't test with monitors of equal size.) This is a common configuration for laptop users. Many programs have problems with this configuration, including Apple's window manager, so Rulers is not unique in this regard.  
(Version 1.0.168)

THEBLADES  I think this app is very usefull and I will use it often.

There is one request that I have:

could there be added a way to change the zero point?

Like in most page layout programs you can go to the upper left corner of the ruler section click & hold then drag your zero over to where you need to start measuring from.

Thanks for such a great lil app and to make it free is exceptional!  
(Version 1.0.132)

HENRIKTEKNIK  This is the best screen ruler I've ever seen. Just like its product name, Rulers is free of any uncertainties as for what it can do, or can not do. No unnecessary bloat here.

Compared to similar tools that I've tried, I find that Rulers is the only app worthy of being called a real pixel scalpel.

Can't say for how long I've been waiting for exactly this app, but it's been long enough to say: Finally, you did it!

On a side note. I have one humble request for a freature, that I'd like to see:

- Undo functionality. As in, if you move a ruler and you moved it wrong, hitting Command-Z would make it even easier to set it back to where it was before.

This is easily worth 5 stars from me.  
(Version 1.0.132)