I have tried one or two of the free sites for text messages to my boss, but it's more hassle than its worth.  I don't have to do many - usually only when he's in a completely different time zone such as Australia or China - but I get 100 free text messages a month on my package anyway, and rarely use up to the limit, so it doesn't seem worth going through the hassle of trying to claim them back.  Although, the FD has said he'd be more than happy to refund them.
My can't live without in the office ?  Has to be OAG travel scheduler.

Kharen