What is the difference between nagios 1.x and 2.x besides

What is the difference between nagios 1.x and 2.x besides database support. Will 1.x be supported in the future? Why did it branch out like this, couldn’t developer left the option for user to compile in Database support? It blows when you want to latest stable version but can’t get database support.

See the change file or the “what’s new” to see what has changed.