Have you looked into taking screenshots via keyboard shortcuts, which is faster than using "Grab", if that is what you mean with "Grabber"?
I have - I have that bookmarked in fact, but I quite like the way Grabber works - Grabber is what the Mac Utility is called after all.
There is this, but saving in a more sensible format in the first place would make more sense.
Image
Command + Shift + 3 takes a screen shot and save as .png on your desktop
Command + Shift + 4 lets you select an area
Command + Shift + 4, Space bar lets you select an individual window
Being a relative newcomer to Mac, it's very much a case of what I'm used to - for a long time I used a little utility called Faststone Capture over on the Dark Side, Grab is similar. I've never used shortcut much until now other than cut and paste.
Oh and my apologies, I see what what I called Grabber is actually Grab.