A 'Dream Dictionary' is a reference material intended to be used as a
look up for keywords of dreams in order to elaborate on the possible
meaning behind the dream. What I need is 20 of the best online
searchable databases on the web providing this service.

Please provide your answers in English and with the following
information: colloquial name (if appropriate otherwise the URL only is
fine), the URL, a brief description of the service, a personal note
about the service and any additional information (perhaps why it is
popular, for example).

As I'm not a researcher, I'm feeling free to just post one site, that
I digged up for a friend of mine only a few days ago. I feel that it,
instead of throwing 500 unknown mythological characters at your face,
simplifies it so that it looks believable (then wether you trust it or
not, is of course, individual);
http://www.dreamdoctor.com/dictionary/