Get flash to fully experience Pearltrees
Mac: If you upgraded to Mac OS X Lion and immediately started finding system settings and changes you disliked, Lion Tweaks is a utility that gives you one-click access to enable or disable all of Lion's most loved-or hated-new features. If the new hidden library folder annoys you, or OS-wide spelling correction is more irritating than it is helpful, or you just can't get used to Apple's new "natural scrolling," Lion Tweaks gives you an application where you can toggle all of those settings on or off quickly. Everything from Lion's new Full Screen Mode to Apple's new resume features are fair game for you to customize.
Mac: It's a cross-platform world, and if you switch between a Windows PC and Mac frequently, you may miss Windows 7's live previews of windows from running apps in the taskbar. DockView is a Mac OS utility that adds those previews to the Mac's Dock. Once installed, you can see at a glance how many windows of any given application are open, even if they're minimized.
Mac: If you're still having a difficult time getting used to Mac OS 10.7 Lion and all of the added features and changes Apple's made, Deeper is a utility from the folks who made Onyx that gives you control over the Finder, iTunes, Mail.app, the Dock, and more. Much like previously mentioned Lion Tweaks , Deeper is a utility that gives you control over the look and feel of Mac OS Lion, and lets you switch many of the new features off or set them to behave more like Snow Leopard. Even if you're not out to make Lion more like Snow Leopard, Deeper also gives you quick access to a number of Mac OS system options and tools that are normally buried in different utilities and menus. The app also lets you control Safari's default behavior and toggle its developer menu. You can disable the iTunes Store or the Ping social network, or change the apps that start when you log in or manage other login options. Deeper is free and available now.