Do a search for Google Wave on the App Store from your iPhone or desktop client, and you'll see an application called just that pop up, ready to be installed as soon as you fork over $0.99.

Link: http://j.mp/8Q0WlM
Title: Google Wave iPhone App Hits The App Store ? Temporarily - washingtonpost.com
Source: http://www.washingtonpost.com/wp-dyn/content/article/2009/11/21/AR2009112101026.html
See who is talking about this page: http://j.mp/8Q0WlM+
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Find more info about Google Wave: http://kb.clipotech.com/gwave