Easy to use and extend bookmarklets
Here's the basic bookmarklet code. The minified code itself was borrowed from Ben Alman's jQuery Bookmarklet Generator
javascript:(function(e,a,g,h,f,c,b,d){if(!(f=e.jQuery)||g>f.fn.jquery||h(f)){c=a.createElement("script");c.type="text/javascript";c.src="http://ajax.googleapis.com/ajax/libs/jquery/"+g+"/jquery.min.js";c.onload=c.onreadystatechange=function(){if(!b&&(!(d=this.readyState)||d=="loaded"||d=="complete")){h((f=e.jQuery).noConflict(1),b=1);f(c).remove()}};a.documentElement.childNodes[0].appendChild(c)}})(window,document,"1.7",function($,L){$.getScript('http://localhost:8080/bookmarklet.js');});
You'll need to change http://localhost:8080/bookmarklet.js to your appropriate bookmarklet code. If neccesary, you can change the "1.7" after document to a specific jQuery version, but this should rarely be neccsary. Other than that, your bookmarklet code should be ready to use jquery.