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Romeo - 2:14 pm on May 29, 2008 (gmt 0)
2) additionally to what Dootch already said, you could give out free test accounts valid for a day or two, if the user base is small enough to handle that Kind regards,
Sven,
3) definitely let the SEs index, how else would the users find you and know that you have interesting stuff.
Do an IP-based check for google/yahoo/msn and let them in as if they are users. There should be no cache-problem if you use the NOARCHIVE tag, all 3 SEs seem to respect this. With google, you may additionally experiment with the NOSNIPPET tag.
R.