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PDF Expert is a really nice pdf annotation app that will let you sign pdf docs, among other things. It captures your signature once and lets you place it anywhere in a pdf with the ability to resize it to fit the space you're working with. You can then email your signed document. The beauty of this app is that it lets you do much more than just signatures, you can add notes to the pdfs, highlight/underline/cross out text (even on jpg text), and type text onto the doc. Even if you don't use it, it's best to have those features there just in case. If you're going to spend the money, you might as well get a nice comprehensive pdf annotation app to handle your signatures.
The fastest most intuitive app for signing documents is definitely Sign-N-Send. Unlike other apps, which force you to create a text box, which you then have to scale and move into place, this app lets you sign directly onto the document. You can import a pdf, sign it, and then email it back in less than 1 minute. Signatures are rendered smoothly without jagged angles even with your finger, and you can also add typed text anywhere in your documents. The modified pdfs remain editable so you can remove your edits any time.
The free version of the app inserts a promo ad on the first page of your pdfs, which you can remove by upgrading to the paid version (which is in the process of being approved by the app store). Once this version is available, it will be a near-perfect app for sending signatures back and forth.
Update: The paid version of Sign-n-Send is now available for $1.99 on the App Store...
I use SignMyPad, which works ok, but the resolution of the pdf gets fuzzy after adding my signature and emailing it. Also, the signature sometimes comes out looking a little geometric rather than smooth.
I have iSignPDF which lets me open a PDF and sign it with my finger. I can also add text for adding my typed name. The signature didn't have vector smoothing, but it did what I needed it to.
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