Dynamic Widgets | Qurl is a very practical WordPress plugin that enables dynamic rules for widgets. With this, for example, the "latest articles" can be suppressed on the homepage (since they are all there anyway and that would be redundant) and, for example, my Tumblr photos can also be suppressed on gallery pages (so they don't distract from the actual image content - and, for example, black and white photos don't suddenly become colorful just because of Tumblr).