Our own experience is to keep any forms you want filled in extremely
short.
Even for the free membership, you should give some kind of immediately
valuable bonus. As that bonus has to be low-cost to you, it should be
a clear info product or white paper.
Continue to monitor the conversion rate on your keyphrases in adwords
(not just click through ratio) - as you are doing. Sometimes the same
ad will convert very well with one group and very poorly with another.
1% CR on a free membership sounds very, very poor to me. The visitors
are not the right group or the offer is not appealing at all.
As Brian suggests, to help you much more we'd need to know more
specifics.
Alec Kinnear
Creative Director
http://foliovision.com