Q: Is there a place that can burn a CD with my digital photos in Paris?
A: Most photo labs in Paris can burn CDs from digital camera memory cards (such as Compact Flash cards), for a fee. The Photo Service chain of labs is the one I prefer, and they offer quite a variety of services for digital photographers.

Q: Can I mail things from the Eiffel tower?
A: Yes. There is a small post office in the tower itself.

From http://www.atkielski.com/inlink.php?/main/ParisFAQ.html

Posting of postcards!!!