[sandyarmstrong]

On OS X, they appear to do the same thing.

On Windows, ctrl-t doesn't seem to do anything.

I don't have Sublime set up on Linux so I can test there.

I suspect the author has an older configuration since he's been using it for almost 2 years, and that the keybinding probably changed since then to cmd-p.

[ryanmacg]

Sublime has both cmd-t and cmd-p in the OS X version, the general thinking for this seems to be related to other editors (such as Textmate) having used cmd-t. By having this in Sublime by default switching becomes easier.

[veidr]

IIRC, ⌘P was Sublime's original mapping, and then ⌘T was added on Mac because the then-extremely-popular TextMate had a well-known ⌘T function that was similar.

[manojlds]

And the famous CommandT plugin for vim inspired from Textmate.