BigTweet: Lets you share links on Twitter with your followers without leaving the webpage. It automatically shortens the link in the process and captures the title and any highlighted text. Of course you do have to log into your Twitter account through BigTweet to allow it to tweet your link but I’ve had no problem here in the year I’ve been using it. This is possibly the bookmarklet I use the most.
TwitterKeys: A pop-up box gives you symbols which you can copy and paste into your tweets.
Pagezipper: If you’ve ever come across articles split across multiple webpages, this bookmarklet combines them into one long scrollable page. Saves a lot of time clicking and waiting for the next page to load.
Clippable: Reduces all the clutter from a webpage and makes it easier to read. Adverts, sidebars, etc are all removed and you are left with the text and images. There are other bookmarklets which are very similar like Readability.
Clip to Evernote: Use this bookmarklet to save a webpage to Evernote, the popular notebook app. I know Evernote has a Webclipper to clip text from webpages or entire webpages, but I find this bookmarklet useful in combination with Clippable mentioned above to just clip the text and images to Evernote and leave the rest of the clutter behind.
Subscribe with GReader: Quickly subscribe to a blog in Google Reader with this bookmarklet.
Show RSS Feed: Try this bookmarklet if your web browser has trouble detecting the RSS feed associated with a site. It will show you the full contents of that feed and also give you options to subscribe in your favourite newsreader.
Delicious Talk: See how many people have saved a particular page on Delicious and what tags they have used to describe the page.
Map that address: Highlight an address on a webpage and get a map showing its location.
List all Links: Lists all links on a page in a pop-up window.
Translate: Uses Google Translate to display the content of the page in English.
Youtubian: Go to a video on YouTube and click this bookmarklet. The page will reload with the video, a search box on the right, related videos below, and download links for Flash, MPEG, and mobile versions of the video also on the right. Click on the Expand link at the top of the page to revert back to the original YouTube page.
If you want to search for more bookmarklets, there’s a directory at marklets.com and here’s a site with over 100 useful bookmarklets for better productivity.
Hope you find some of these useful. Drop a comment on any I’ve missed that you like.