Yep, an email from ancestry@ancestry.com came four days after I mailed it from Texas. The subject line was "AncestryDNA update: Your DNA sample has arrived."

Body of message:

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Good news! Your DNA sample has arrived.
AncestryDNA™ has received the sample with the activation code: (code)

You can expect to receive your results in the next 6-8 weeks, so look for an email from us notifying you when they're ready. In the meantime, we encourage you to update your family tree or start a tree if you don't already have one.

Thank you,
The AncestryDNA team
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You might check your spam folder for some of those keywords. It says to contact memberservices@ancestrydna.com if you have any questions - maybe give them a buzz in a few days if the email still hasn't come.

Meanwhile! Hey, we could do a whole new comparison on the DNA testing companies and their mailing procedures.

Ancestry and 23andMe get a point for not requiring customers to affix postage. 23andMe gets a point for providing a tracking number. I think the only way FTDNA will get a point is if someone really loves padded mailers more than the boxes. :)