Java developers

Hey, there.

I am researching the Spring and AOP and wonder if anybody has had a real-life application of these relatively "new" concepts. If you did, what is your take on this? Is it worth looking into much further?

Thanks a lot for your input (even 2 cents count :) ) .

-C.

Anyone have a code of writing a least squares algorithm??? I need it for my thesis work.
And if someone have a code of how can I connect search engines from java and enter the top 100 answers for a quary into array I wold be glad twice ;)
Thanks a lot ( And sorry for mistakes in my english)