This is my startup - we're just trying to have a little fun with the demise of Google Wave. If you want a free account just email wavegoodbye@wizehive.com and mention you're from Hacker News and I'll make sure to hook you up.
Wizehive sounds great, seriously, I just read your page for about 3-4 seconds (until I worked out there was no cash around), but I think you should splash some cash around. After all, your biggest potential competitor just gave up - the same guys that all those investors asked what you are going to do about for all those years, they are gone now. Time to make it rain bro!