What a goofy little website. http://www.connectionstrings.com
Thanks to LLBLGenPro I don't have to deal with connection strings as often as I used to, but when I do, remembering the arcane values both needed and possible is difficult, especially on non-SQL Server platforms.
This web site lists the standard connection string types for most all databases and connection methods. It doesn't go deep enough with the attributes, but it does demonstrate the standard usage and refers you to further documentation.
Great!