My Google+ account’s Sparks feature kindly pointed me to this excellent little article "7 Common Mistakes Made by Angel Investors". Those 7 are…
- Not looking at enough deals.
- Not making enough investments.
- Not knowing when to quit.
- Expecting a quick return.
- Not doing thorough due diligence.
- Not reserving additional capital for the inevitable follow-on round.
- Following a herd mentality.
The post goes into detail on each item, a good read.