Oz Linden has put up a link to a new HTTP Project Viewer. You can find it in the SL Wiki on the Second Life Alternate Viewers page.
Part of the Shining Project is improved client/server communication using HTTP. Redoing the HTTP coding in the viewer and servers is the project. The stated goal is:
The start of a unified approach to HTTP-based communications between the viewer and grid services with a goal of achieving reliability, consistency and a better overall experience on the grid.
This project viewer has some of the changes the Lindens think will improve things. They are looking for bugs, gathering data, and asking for feedback. The project viewer will allow people to help out.
Oz says:
…if you have had problems when you enable the use of HTTP, we would very much appreciate your giving this a try. We know that it does not yet solve all the problems, but we think that it solves some and provides the first steps needed for solving some more in the future.
If you are one of the people that have had problems with things rezzing slowly, inventory failing to load then this is something that may help you or, at least, get the Lab the data they need to fix the problem.



