SP5 is unable to populate login fields for the following (SP4 also fails here)
1. www.asos.com (IE8, Chrome; fails to enter username or password)
2. www.mjiteamworks.com/ipw (Note - this site needs to be added to 'Intranet' in Internet Options>Security)
IE8 - fails to enter company code but does add Username and passowrd; in Chrome all 3 fields populated but unfortunately this SaS application is not Chrome compatible.
3. RealVNC 'Address book' (Working in Windows 7 x32, not working in x64)
However, I found that the Chrome plugin for SP4 frequently caused tabs to freeze, esp if window was left open in background. This appears to be fixed in SP5.