I just joined as well. I switched to MAC Os et al after too many blue screens on the PC. There are still things that I am used to on the PC that I wiah I had on the MAC, but mostly am pleased with the Mac.
Big thing I loved on PC was the Screen print option, then pasting it into Paint and then being able to manipulate it there. I have found grab it, but what about a simple paint program?
Hi JustMeLeo
Intrigued by your question, I had a rummage around my iMac.
I assume you're on 10.4.x as a minimum, since you mention grab it?
Shift+Apple+3 will take a snapshot of the entire screen; Shift+Apple+4 will let you define the area you want to capture.
Once you've done either of those, a picture.png will appear on your desktop.
Click on it, and it fires up Preview automatically.
Preview, I learned today thanks to your enquiry, has image-manipulation built in. You can further select a part of the image and (assuming it's a photo of someone/something) you can change the contrast/sharpness/dark+light point and many other things associated with Photoshop and Flickr. Also, if you crop something out, that also appears on your desktop as a separate img file.
It's good. I'm impressed at this default software in OSX. What else did you want from a paint program which you miss?
Best wishes