I did a search on 4 letter .coms from AAAA to AZZZ and registered the 4 that were still available from registering. They should be completely gone by now if the results I got from DomainTools were accurate Will the value 4 letter .coms go up like 3 letter .coms? Should I register the .net and .org version as well?
Here is another thread. just for this one. http://forums.digitalpoint.com/showthread.php?t=208767 thought would let you know.
Its when someone hold onto the domain for a few days to "taste" if there are decent traffic coming in.
The registrar will repeatedly drop and then register the names. Sometimes they register right after the drop. You just have to keep track of the whois info over months. The easy way for four letter .com is to look for either: belgium domains capitol domains in the registrar info.