Here is what you do.
1. Go to http://www.evernote.com on your iPad or iPhone
2. Bookmark that in Safari
3. Go to Bookmarks in Safari and edit the Evernote bookmark you just did.
4. Change the name/title to ‘Evernote Clipper’ or whatever you want it to be.
6. Save out of everything and go to a website or something and then when you are on the page, hit the bookmarks icon and select ‘Evernote Clipper’ bookmark to get the Evernote clipper screen.
You might need to do the initial Safari login to Evernote, but after that, you should be good to go.
Update 05/09/12: It has also been reported on iPhones that it is best to set the Safari Options on “Open Links” from “In New Page” to “In the Background” if you are having resizing issues. Here is how you do it–
Go to “Settings” on your iPhone then Safari.
Change that “Open Links” option to “In the Background”