Hi thanks for the tip. I had been trying to download this for some time without success. I must admit I'm still put off by the fact that it's a 'command-line application' - whatever that is (I'm on OS X and I keep well away from the Terminal).
Oh and you can do a lot of this with a text editor that understands regular expressions (is anyone else using these BTW?), with a fairly simple expression changing _word_ to word can be done in seconds.