sort by custom field?

Hi there,
it just came in my mind:
can I sort the blog items by a custom field?
In a future project I will have a number of Events per category. I want to sort them by start of the event/date.

thanks for reading!
my license is for new-heritage.de
as this client accept the draft, they will order for their domain (http://www.gsskl.com.my/willkommen/)
and no hurry:-)

Klaus