The beginning of the Bagle.AF outbreak last night looked pretty bad, as the initial burst of infections was big and worldwide. However, since then the amount of infections has leveled out and we don't expect this to become any bigger problem. It seems that the virus was seeded much more aggressively than some of the other recent Bagle variants.
Seeding is when the virus author sends the virus to a long list of email addresses to start the outbreak. This is typically done with spammer tools, from third party computers the virus writer controls and owner of which knows nothing about this.