letting Britain2012.com and England2012.net drop weeks before the Olympic decision (thought NY would get it and had some NY names)
not getting more .ca names at the landrush, like popular two word combos, etc., but didn't know about overture/goto scores at the time
taking a break from domaining from around 2001 to 2004
and the usual, not seeing the potential of domains in the 90's, etc.