Probably the best thing that be currently supported is getting two diverse
connections to a single provider that can globally aggregate your network.
The connections should go to different POPs and should follow seperate
physical paths. This should provide you the desired reliability and load
sharing.
This solution has been pointed out before.
Also, Dorian Kim sent in a good message to the Big-Internet list talking about
reliability (the stated goal of most multi-homing), and the 7 places you could
do redundancy, and what was really important in achieving reliability, which
contained a lot of good insight. Here's his message (appended).
Noel