I've come across three ways to make a Wave "Public" - though none of them cause it to appear in the search box within the wave application itself. I haven't tried any of these myself though - and don't blame me when the YakYak wave gets inundated with spammers
1)
http://www.wavesyndication.com/#top
2) "You add
public@a.gwave.com your contacts, then add it to the wave. (When you add it to your contacts, it will say that it's not a valid user, but just press enter anyway. Also,
public@a.gwave.com will not stay in your contacts list. You have to add it again every time you reload wave)"
3) Us the blog bot (
blog-bot@appspot.com) to create an embedded version of the wave to stick onto a public website somewhere. At the moment the wave will only be visible to people logged into Google Wave though.
But I favour the invitation only approach, personally. The Wave's already a complete mess, and only threee of us have been using it so far
