This is how you add a Google Bookmarklet to your iPad.
1. Add a bookmark at ANY random page on the internet and label it "Google Bookmark"
2. Add this bookmark to wherever you like within your iPad bookmarks. (I put mine in my Bookmarks Bar so it's easily accessible)
3. Once that's been created, find the bookmark you labelled "Google Bookmark" and click "Edit" to edit it.
4. Paste the following into the "URL" field of the "Google Bookmark":
javascript

function(){var%20a=window,b=document,c=encodeURIComponent,d=a.open('http://www.google.com/bookmarks/mark?op=edit&output=popup&bkmk='+c(b.location)+'&title='+c(b.title),'bkmk_popup','left='+((a.screenX||a.screenLeft)+10)+',top='+((a.screenY||a.screenTop)+10)+',height=420px,width=550px,resizable=1,alwaysRaised=1');a.setTimeout(function(){d.focus()},300)})();
5. Click Done
Now, whenever you are at a page that you want to add to your Google Bookmarks, just click on the "Google Bookmark" link on your iPad, a new page will pop up in Safari, where you can easily add the bookmark to your Google Bookmarks online.