$$ which i'm thinking can be reset at one point or another.
As long as you're on a system that uses incremental process ID's, you will probably be safe. Process ID's cycle when the maximum has been reached (I think it's 65535 on my system) when they're incremental, but forking that often in a single second is very unlikely.
However, Not all PIDs are simple incremental. Some are randomly chosen, and in that case, especially with short running scripts, you have a greater chance of having two identical IDs.
My concern doesn't deal with $^T
It contains the start time of the program (read: interpreter), which can cause problems if your interpreter is a long running interpreter like mod_perl or one of the many fast-perl-CGI things that avoid forking interpreters. Better is to use time, which returns the current time.
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