I converted my playground web client sketch for the ethernet shield to wifi. It took only a few minutes and it is working fine.
BTW, all these are "Perfect World" sketches so far. I will move them to "Real World" (start torturing them and add fail recovery) when I determine they work ok.
Next is web server.
edit: I just finished converting my new web server code for the ethernet shield to the wifi shield. It works ok, but is a bit more sluggish than the ethernet shield. It takes about twice as long to download the images.
The email client code has been completed for a while.