I think it is possible by altering the routing table manually, though I haven't tried it but I think I have seen it somewhere. Even if applicaton level redirection to different isp is not possible, you can seggregate traffic based on destination network, if this is possible.
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Winchester 3200+ @2,500MHz
LeadTek 7900GT VOLT MODDED @ 680 core, 1800 mem
2x1GB Transcend DDR400 @ DDR454 2.5,3,3,5,1T
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