A few months back, Adam Machanic launched a competition about "Grouped string concatenenation" here http://sqlblog.com/blogs/adam_machanic/archive/2009/02/27/t-sql-challenge-grouped-string-concatenation.aspx
Now Adam has publish his results here http://sqlblog.com/blogs/adam_machanic/archive/2009/05/31/grouped-string-concatenation-the-winner-is.aspx and luckily my fourth suggestion was considered the overall winner!
When seeing my competitors, I am humble to see that my suggestion performed better than other suggestions made by such people as Itzik Ben-Gan, Remus Rusanu, Rob Farley and others.
Of course I am proud to win the MSDN Premium subscription, and now I have a hunch that next competition will be with Microsoft to get this baby activated ;-)
Thanks to all who participated. I have learned a few new tricks.
And I will have to really investigate the execution plans for my two other finalists, Leonid Koyfman and Rick Holliday.