Very nice. Personally I'd rather see a ticker tweeter that updated only around, say, every other hour or thereabouts though, as every 5 minutes would be a bit annoying to me in my twitter stream.
I was going by (as far as I can tell) the same time frame as the MtGox bot. That said, I can see it getting annoying (My twitter stream is rather crowded so I'm only noticing it very infrequently).
Any other suggestions on time between tweets?