Blogger API changes
Blogger Developer blog has posts about supporting Echo as blogging API. Echo is volatile and not finalized yet.
I personally feel XML-RPC is more than enough,but still have to investigate what advantages will SOAP have. Thank God!They didn't say web services!
My client supports Blogger API 1.0 , anyway. Good enough for me.and many others I suppose.

BlogClient Status
The client is almost ready.
The current features :
1. Create Blog Details
2. EditPane with text style capabilities [Bold, Italic, font size, font family and color]
3. Post and Publish news Item.
Will host it somewhere ASAP.