Just in case you missed it, 3CX also aquired an Android based SIP client. The resident Android fan boy here at Landis Computer (not me ;-) did a quick test of the client but said that while it really looks nice he wasn't able to get it to register so he used another Android SIP client. We plan to do a video review of the 3CX Android client as soon as a little time affords. Read More Here.
Blink for Windows and Linux has been postponed, according to http://www.icanblink.com/ website. From my experience AG Projects puts out very quality software. I'm looking forward to Blink for Windows and I expect it to be similar quality once it gets here.