IE (Finally) Gets Several Big Fixes
One of SP2's most useful features is the pop-up (and pop-under) ad blocking it adds to Internet Explorer, letting you stop any unwanted browser windows from spawning. IE will permit pop-ups you initiate purposefully, such as when you click a link that triggers a new window, and it will allow you to view blocked pop-ups via a handy (and surprisingly unobtrusive) Information Bar.
Less successful is IE's new Manage Add-ons feature, which permits you to disable unwanted browser plug-ins. Some plug-ins, such as adware programs, can be quite malicious. While the ability to disable undesirable plug-ins is laudable, Manage Add-ons is unable to delete them completely--a silly limitation when many PCs already have useless (and potentially dangerous) spyware or adware plug-ins installed, and the process to remove plug-ins is tedious and user-unfriendly (click Tools, Internet Options, click the Settings button, click the View Objects button, select the plug-ins that you don't want, and press the Delete key).