A warning for people who use Link Manager. This plugin will see that widget disappear from your available widgets and worse, will delete all your previously created blogroll links. Deactivate this plugin and they're still gone. Installing this plugin has costs me hours of extra work. There is no warning anywhere that this would happen.
While I like the idea of this plugin, I think it's wholly wrong to put forward a plugin that can do so much damage without comprehensive notes to warn people appropriately.