If you want to understand the different security aspect in Web Services I recommend you this new cool MSDN Article: How to use Web Services Enhancements 2.0 to implement security, trust, and secure conversations in Web services architecture.
I finally gots my new notebook, a HP nx7000 notebook. WOUAH !! Impressive. WIFI, Bluetooth, SD Reader, 1.6 GHz, 1 Gb RAM (now 512Mb but waiting the extension), 15.1'' Screen (16/9, 1680x1050), Radeon 9200 Mobility 64 Mb, 60 Gb 5400 RPM and Windows XP Pro.
I am currently setting it up for our whole team with Microsoft Tool: Sysprep.