Last week in China was a bloody nightmare. Company email and calendars run from Google Apps platform. I have Blackberry and a VPN as a backup for accessing mails when in China.

Guangzhou - able to access both VPN and Gmail
Haikou - able to access Gmail but not VPN
SanYa - able to access Gmail but not VPN
Xi'an - not able to access either VPN or Gmail
Beijing - not able to access either VPN or Gmail
Tianjin - not able to access either VPN or Gmail

Of course, with 3 days of Blackberry outages thrown in for good measure my voice roaming charges will not be pleasant this month.