That's right, AudioBoo has listened to their member's suggestions to add private voice messaging. This bringing them one step closer to Snapv!ne in features. So far Chirbit, and AudioBoo now have private messaging, which puts them a step ahead of CinchCast in my book, but CinchCast has the ability to "blog via phone", a much sought after feature by us Snapv!ne veterans. However, I have read in AudioBoo's support forums that they are planning on adding back a previous feature to allow members to blog via phone that they call PhoneBoo. I also have been talking with Ivan " the deloper of Chirbit", and he says he has plans to add a "blog via phone feature" to Chirbit soon as well.
As far as widgets go, I am most impressed with AudioBoo's widgets as they have a very versatile widget for embedding and displaying your blog in three different formats including your blog posts. your followers blog posts, or your favorite blog posts. Cinchcast has some nice widgets as well as far as I have seen. This is an area that I think Chirbit needs to improve in.
All in all, I feel that all of these sites have their advantages, and weaknesses over each other and it will be exciting to see who comes closest to having all of the features that we helped invent, and loved so much on Snapv!ne.