Hi Simon,
The issues we faced was with the stored procedures in 10G. Mostly name resolution of variables and procedures. But these were easily resolved by changing the naming convention and small fixes. We now have a production system running without any issues.
Regards to tuple space servers I think these threads might help:
[1] https://openacs.org/forums/message-view?message_id=179348
[2] https://openacs.org/forums/message-view?message_id=285980
