Hi Joe:
Even though mainstream Relativists don't like it very much right now,
I do think the
Tachyon theory has a bright future ahead of it;
and they will eventually fall in love with it.
That is because this theory is their only
hope to cope with
superluminality,
to explain away all recent experiments on
superluminal light propagation,
and to keep
Special Relativity, all at the same time.
You may find the following articles on this subject useful:
[1]
http://en.wikipedia.org/wiki/Tachyon
[2]
http://www.daviddarling.info/encyclopedia/T/tachyon.html