SANS writer Benjamin Wright has created this template report for storing evidences for investigations.
Its really good as it includes special txt file giving authority to investigation which keeps investigator safe. It is always and highly important that investigator has to play safe otherwise might end up in screwing himself legally.
It is good from legal perspective and also provides focus for investigation, however one thing I find missing is Time Line. I believe it plays very important role for any investigation. Also I believe it should have a column for listing out the who are the people involved in the issue and may be their scope.