This is awesome and well deserved. When we were looking at what collaboration tools to use at Kicktone, Lechat (as Kato was then known) was the one I was most skeptical about - after all, why wouldn't we just use IRC?
Today, it's the tool we can't live without, which has saved our arses more than once, which we happily pay for and will continue to use as we grow.
Awesome! Congrats!
Hope this means native client apps soon ;)