oregon_chirp_cache
The oregon 600(t) and 650(t) are fully chirp compatible. They are shipping in the USA since last week. For EU costumers they will start shipping from next week.
With the built in ANT receiver you can do chirp caches as well. (it looks like it is faster then my old oregon 550)
I did tried it on my own chirp cache
Next week some geocaching info about the oregon 600 /650.