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Following are some papers that you might find useful in using GPS:
Practical GPS Surveying A concise guide for the surveyor that wants to use post-processed GPS for high accuracy surveys.
Ground Coordinates A document dealing with the conversion of GPS positions to a ground level system.
The Ashtech FTP Site is an excellent source of information to help you get the most from your system. These are some papers I found especially informative:
Filetypes.pdf A breakdown of the different file types that are extracted from a raw data file.
To view the latest firmware and software versions please visit the appropriate site for your product.
Novatel http://www.novatel.com/support/fwswupdates.htm
Ashtech ftp://ftp.ashtech.com/
California Public Base Station Users Note.
Did you know that there are more than the NGS CORS stations that can provide base station data? Check out the California Spatial Reference Center Site. This site lists CORS stations plus SCIGN and BARD stations throughout the state.