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If you have plain tabular data you wish to work with, try this page from gpsvisualizer.com
Please select the KML file you would like to add alitude for, subject to the following restrictions*:
* However with enough interest will consider lifting any of these restrictions, but might add output as KMZ to save bandwidth, but that will be transparent to you, the end user.
*** It works for me but your mileage may vary! Use at your own risk, no guarantee is offered. ***
*** New! Download the (very simplistic) Source Code (Released under GPL) - gisdata.usgs.net lookup added thanks to Lowell Stewart!