Just recently we started using Clickatell for SMS escalations/notifications (I manage a NOC Team). I just threw together a pretty basic web interface to send messages via their HTTP API. It never occurred to me that somebody may have already written a module for this, but after reading your post just now I checked and found Net::SMS::Clickatell - heh.. I guess I shouldn't be surprised. It does however look fairly basic, so I'm not sure if I'll start using it or not - I'll at least take a look at it.

Anyway, to provide an answer to your final question¹ - yes, we use Perl at my workplace to send SMS messages all over the world via Clickatell. At the moment we are only using it for sending messages, but I do know that Clickatell do provide (for a cost) a two-way service - so I do plan to investigate this in the not-too-distant future. Perhaps I'll come back to this node and provide an update afterwards.

Cheers,
Darren :)

1. Which you appear to have re-worded since I posted my reply, which makes my response look a bit silly :( ..originally it was something like "Does anybody use Perl for sending/receiving SMS..."