list of Style Guides and UI Guidelines

1. 3M
2. ABB Brand Identity
3. ACDSee Brand Style Guide
4. Android User Interface Guidelines
5. Apple Human Interface Guidelines
6. Apple iOS Human Interface Guidelines
7. BBC Future Media Standards & Guidelines
8. BBC Global Experience Language (GEL)
9. Belfast Zoo Brand guidelines
10. Blackberry and RIM wireless handheld UI Developers Guide
11. BlackBerry Branding Guidelines
12. Cambridge University Brand Manual
13. Eclipse User Interface Guidelines
14. GOOD Technology Brand Identity Guide
15. Gnome Human Interface Guidelines
16. Heineken Brand Manual
17. iPhone Human Interface Guidelines
18. Java Look and Feel Design Guidelines
19. KDE User Interface Guidelines
20. Microsoft Inductive User Interface Guidelines
21. Microsoft Surface User Experience Guidelines
22. The New School Visual Identity Manual 
23. Nokia Design and User Experience Library
24. Oracle Technology Network Guidelines
25. Palm User Interface & Human Interface Guidelines
26. SAP Interaction Design Guide for Internet Application Components
27. SAP Design Guild
28. SAP User Interface guidelines
29. Silicon Graphics Indigo Magic User Interface Guidelines
30. Skype Brand Identity Guidelines
31. Reuters Brand Center
32. Taligent Human Interface Guidelines
33. WebEx brand style guide
34. Web Style Guide 2nd edition
35. Windows User Experience
36. Windows User Experience Guidelines
37. Windows User Experience Interaction Guidelines
38. Windows XP Visual Guidelines