Have you ever burned your hands by some new and immature technology?

Question

I often hear people saying you shouldn\'t rush into adopting new technologies until they have become stable, tried and tested. There is even a joke on how it takes 3 versions to

Answer 1

Several years ago, we made heavy use of the new SQL Server 2005 feature called Notification Services. To our dismay, that has been discontinued in SQL Server 2008. This was a serious problem, caused the software architect to question all new Microsoft technologies.

Here's some detail and some more and some more

There have also been issues with Microsoft's Entity Framework.