Often When programming with different data sources, I need to manually build connection strings. With each provider having slightly different syntax, its impossible to remember them all. Rather than hunt through documentation each time I use this website: connectionstings.com
They have a good list of the most common connection strings with examples for SQL Server 2000 / 2005, Access, Excel, Text, Oracle, MySQL etc. Next time your stuck needing a connection string, try connectionstings.com first.