RSS is an XML format file used to make summary information available to clients. They are available on many websites, and are read in a news aggregator, similar to a usenet news reader. It allows one to remain current with a great many sites without having to actually visit each site. Clients are available for virtually any platform. In this case, you could have a feed for each cache you are tracking, and whenever a new log entry is posted for that cache, the aggregator would let you know and give you the option to read either the entire log entry, or a short summary of the entry.
The sandbox site would, and I'm guessing here, be a mirror of this site used to test new/modified code before it is put into production (at least that's how we use them).
Examples:
http://www.disobey.com/amphetadesk/
http://www.feeddemon.com
http://www.sharpreader.net
etc etc etc