How to take a screenshot?

So you want to take a screenshot eh?
Sure.

Windows:
Hit the printscreen button. This will immediately take a snap of whatever is one the screen at the time.
BAM!
(Alternately, Use Alt+Printscreen to snap only the active window)

Simply Open paint, and hit control+V. Or go edit > Paste.
Now, Go save as.
Change your filetype to .JPG.
.JPG will yield the smallest filesize, although you lose some quality, it's a sacrifice you have bloody better be willing to make.

Now. open your browser of choice.
In the lil' address bar, type in WWW.IMAGESHACK.US
Its just the easiest for me, since it hosts a multitude of filetypes.
Click the browse button, and select your file.
You want the box that says "Direct link to image".
You need to copy that direct link, and paste it between the image tags, like so.

Code:

[img]LINK HERE[/img]

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Screenshots for the Mac user:

There are few ways to take a simple screenshot. All of them will give your fingers a much needed stretch.

1. [ Shift + Command + 3 ]
This takes a picture of your entire screen.

2. [ Shift + Command + 4 ]
This changes your cursor so you can select what you want to screen. Hold down the mouse button and draw a box over what you want to screen. When you are ready, realease the mouse button and the screenshot will be taken.

3. [ Shift + Command + 4 + Spacebar ]
This will allow you to sceenshot whatever window you highlight.

The files will be saved as a PDF on your desktop.

Now if you don't have Photoshop or some other image editing software, things get a little complicated since the Mac Preview application doesn't give you a whole lot of control. There is a way to crop and convert the PDF to JPG/PNG with Preview. But scaling your image so it's not a huge file is a little difficult.

Drag the PDF into the Mac Preview program.

If you need to crop the image, use the select tool [ Command + 3 ] to highlight the area you want to crop. The press [ Command + K ] to crop.

Under the file menu you can export the image as a JPG or PNG [ Shift + Command + E ]

Now you have a cropped image, but the size is still 100%.
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Notes
- Macintosh also comes with a screen shot application called Grab. I believe it is located under Utilities. You may find it useful.
- Avoid .BMP like the plague.
- You can get programs that take screensnaps for you, and automatically save them in an individual directory.
- Microsoft Paint has one of the worst .JPG save quality ever. Use Photoshop if possible.