Linux 2.6.33 has not been released yet.
Summary:
1. Prominent features (the cool stuff)
2. Various core changes
3. Block
4. Virtualization
5. PCI
6. MD/DM
7. Filesystems
8. Networking
9. Security
10. Tracing/Profiling
11. Crypto
12. Architecture-specific changes
13. Drivers
13.1. Graphics
13.2. Storage
13.3. Networking devices
13.4. USB
13.5. FireWire
13.6. Input
13.7. Sound
13.8. Staging Drivers
13.9. V4L/DVB
13.10. Bluetooth
13.11. MTD
13.12. HWMON
13.13. ACPI
13.14. Various