1. http://www.google.com/search?q=LP+to+CD+--+removing+clicks%2C+pops+and+crackles should be sufficient to see what's out there.
2. If you do have some recording that is almost there save that one click, try AUDACITY and manually edit it. Try reducing it's peak or whatever else you wish to try.
I have been somewhat cautious about using any of the declicker and decrackler filters on my digital copies of LPs, but I have finally looked at some of my second hand records. They are not in very good condition, and clicks and crackles are quite noticeable. I decided to try out the Nero ultra II declicker. I set the click size down to 1 millisecond and the click threshold at 20 % and found the results quite satisfactory even though a few clicks got through. I tried the declicker on some real bad records and the results were not at all good.
I then experimented with the decrackler but it seemed to add too much mud into the music.