I've been on a bent lately, and here is a screenshot tip that will appeal to both Mac and PC users. If you take a lot of screenshots of Web pages, check out Awesome Screenshot, a handy little Chrome extension that's easy to use, with just the right amount of features.
When it installs, it adds a small button to the Chrome toolbar. Click on the button, which looks like a camera lens, to see the three capture options: Capture Visible Part of Page, Capture Selected Area, and Capture Entire Page.
When you capture a screenshot, Awesome Screenshot opens up a new tab with your screenshot. Above the screenshot is a row of annotation tools. You can crop or add arrows, rectangles, ovals, lines, and text. There is also a very good blur tool so you can obscure any personal information. To the right of the row of tools is an undo button. Click Done when you are done and you'll be able to save it online (temporarily for three days on Awesomescreenshot.com or permanently on Diigo.com), save it locally, or print it.
Do you have a favorite screenshot app? If so, please let me know in the comments below.