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We often resize objects to fit into a certain size. And such operation has a short cut - Ctrl-T (free transformation). But sometimes we need an additional tweak of the perspective. There is a separate menu item to do so: Edit, Transform, Perspective. This tool is useful, though most of the time something simpler would suffice. And that's a neat trick in Ctrl-T mode - while holding Ctrl key drag any of the corners to freely adjust the shape.
Note: You may drag the sides as well, and to lock the movement only to one of the directions hold Ctrl and Shift.
Extra: To ensure that your lines are straight in the picture (while adjusting perspective) press Ctrl-' to reveal the grid (press once more to hide it).

You probably heard about GIMP, the free photoshop-like software. This is an open source project, which resulted in a robust software with many features, you may even compare it with Photoshop, though Photoshop was on the market for years and they have a lot of money and time to tune up and upgrade the application.
What is GIMPShop? Well, GIMPshop is a adjustred version of the GIMP. The idea was to make the UI more like Photoshop. And now GIMPshopw is available for Mac OS as well as Windows. You may want to findout the difference between Photoshop and GIMPshop, so read the post at blog on GIMPShop.

To hold your finger on the pulse of latest news from Adbobe about Photoshop, there is a special website for such people - PhotoshopNews.com. As one of such news is the latest update of Photoshop software or update to Bridge application.

For example, there is even a post:

From the Adobe Photoshop Windows User to User Forums comes a report that the 9.0.1 update for Windows effect mouse clicks on menus in some cases. Menues require an extra click to regain focus from non-maximized document.