These are small chunks of javascript as links that, if made into bookmarks will alter your browsing life.
To install, drag these links to your toolbar.

MailToCarl    Select an interesting chunk of text and click this in your browser's toolbar and it composes an email to me. The subject line is the title of the page followed by the first 30 characters of the selected text, and the body of the message is the text you selected followed by the URL for the page the text came from.  Pages with frames can goof this one up, you have to open the frame itself and then use the favelet, and it'll probably work.

Even though this is a tiny little dirt road well off the information superhighway I have spamtrapped my address in the favelet. You can choose to put up with removing the SPAMTRAP each time, or edit it out of the code... after you install it in your browser. The bookmark editing tools should let you do it. Heck you can modify it to send mail to anyone.

GoogleMap  Select an address, get a map in a new window. Test here:   38 Guinan Street Waltham MA

Google  Select a word or phrase and get a google search in a new window

M-WDict   Select a word on a page and click this and it finds the entry in the Merriam-Webster on-line dictionary

WikiP  Select a word or phrase on a page and click this and goes to the search page at the Wikipedia and shows the most relevant results. In a new window.

eBay  Select a word or phrase on a page and click this and you get the search page at eBay that shows their results.

TextToLink This one re-writes URLs in the text of a page as a linked URL which you can then click. Saves copying and pasting. Test here: www.prospecthillforge.com  (I did not write or even edit this one but I really like it)

I ran into this concept as a 'favlet' on www.confusingwords.com/about.php and like they say there, "Thanks to Steve Splonskowski for the favlet script." I'm standing on his shoulders big-time.
Thanks Steve.