A bookmarklet is Unobtrusive JavaScript stored as the URL of a bookmark in a web browser or as a hyperlink on a web page. Bookmarklet can make certian tasks much easier like one click to to do things like send a link to twitter.
Make your Bookmarklet easier turn on you iPad’s Safari Bookmark Bar.
Here are some great ones from Digital Inspirations:
Readability
This provides a distraction–free reading environment on the web. The bookmarklet will remove all the clutter from web pages and what you get is a clean and comfortable reading view.
Translate to English
Reading a page that's not written in your native language? Click this bookmarklet and it will translate it to your language using Google Translate.
Shorten with Goo.gl
This bookmarklet will create a short URL of the current page usinggoo.gl.
Download as PDF
Lets you download the current web page as a PDF file that you may attach as an email or read it offline.
Read the NYT
If the NYT paywall is preventing you from reading a Times' story, this bookmarklet may help you bypass the restriction (see alternative).
Share on Tumblr
Post the content of the current page, be it an image, video, text or something else, to your Tumblr blog.
Share on Facebook
Share any web page with your Facebook friends.
Share on Twitter
Lets you post the URL and title of the current page on to Twitter.
Send to Instapaper
Save web pages directly to your Instapaper account with a click.
Google Cache
If a web page is offline, you can retrieve a copy from Google Cache.
Coral Cache
If you are unable to access a web page due to ISP filtering or because of any geo-restrictions, Coral Cache can fetch a copy for you.
QR Code
When you want to quickly send the URL of a page from your iPad to your iPhone or Android phone, simply use QR Codes (see alternatives)
Google Bookmarks
Save the current page to your Google Bookmarks.
Google Dictionary
Select a word on the page, copy it to the clipboard and then click the bookmarklet to find its meaning, pronunciation, synonyms, etc. using Google dictionary.
Flip to Bing
Google is your default search engine in Safari but if it can't find the information you are looking for, click the Flip to Bing bookmarklet and it will execute the same search on Bing. There's no need for you to re-type the search query.
Add to Wish List
Lets you add an item to your Amazon's Wish List. You may even add items to the wish-list that are not listed on Amazon.com.
Subscribe in Google Reader
Subscribe to a blog with Google Reader. The bookmarklet will automatically figure out the RSS feed of that blog.
Share It!
You've previously seen sharing bookmarklets for Twitter, Facebook and Twitter but if you would like to share stuff on a different social sites - like Reddit, Google Buzz, StumbleUpon, etc. - use this universal sharing bookmarklet (see alternatives).
Search Site
If a website is missing a search box, you can use Google's Site Search function to search for internal pages of that site.
Send to Evernote
Save pages to Evernote, an awesome note taking software.
Google +1
With the Google +1 bookmarklet, you can +1 any web page from your mobile browser.
Here are some more I have found around the web:
Add the Bookmark on del.icio.us Bookmarklet
javascript:(function(){f='http://delicious.com/save?url='+encodeURIComponent(window.location.href)+'&title='+encodeURIComponent(document.title)+'&v=5&';a=function(){if(!window.open(f+'noui=1&jump=doclose','deliciousuiv5','location=yes,links=no,scrollbars=no,toolbar=no,width=550,height=550'))location.href=f+'jump=yes'};if(/Firefox/.test(navigator.userAgent)){setTimeout(a,0)}else{a()}})()
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Add the Digg This Bookmarklet
Add the Stumble Upon Bookmarklet
javascript:(function(){var%20a=window,b=document,c=encodeURIComponent,d=a.open(%22http://www.stumbleupon.com/url/%22+b.location,'StumbleUpOn','location=1,status=1,scrollbars=1,resizable=1,alwaysRaised=1,width=800px,height=600px');a.setTimeout(function(){d.focus()},60)})();
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Add the Translate to English Bookmarklet
1. Add this page as a bookmark by tapping the "+"
2. Find the bookmarklet below that you want, and select and copy the Javascript to your clipboard.
3. Go to your bookmarks and edit the new bookmark. Edit the name and paste the Javascript in the field for the URL.
4. Done.