I'm sure someone must have already done this and I'm just incapable of finding it (despite Googling it myself) but I figured that the only thing missing from the brilliant LetMeGoogleThatForYou was a bookmarklet, so I made one: LetMeGoogleThatForYou. Highlight text, click bookmarklet and voila - patronisation on demand.
Rex Swain's HTTP Viewer is a great tool for checking HTTP status codes, redirection, and so on. I've been unable to find a bookmarklet, though, for sending the URL I am viewing to the viewer automatically, so I put one together:
Rex Swain's HTTP Viewer