A bit of frustration here.

I have a Sony Video camera (AVCHD) which churn m2ts files.

I don't really care about editing bit. But still, my Final Cut Express 4.0 can't even retrieve the files.

Is there application out there that can merge the files (m2ts) into a single one without too much processing.

I was able to do that with MTSMERGER (freeware) on my Windoze PC!