Just installed ubuntu on my new Dell studio 1555. I should say I'm pleased with the way it works. I had a small issue with the display while using the live CD - it didn't work, However the solution was quite simple.
I had to add "nomodeset" to the kernel boot parameters while booting using the live CD.
Adding "nomodeset" to the default boot parameters solved the problem for good.
Thanks to Ben for his blog post.
More updates later...