Integer Operations and Floating Point Operations are not comparable.
Of course... but then the whole hash/sec on Bitcoin Watch is an estimate anyway...
So, when you get down to it, all these numbers are meaningless.
However, knowing a rough ballpark of a FLOPs rate *is* interesting, because it does help you think in scale of the TOP 500.
But you can't actually assume any kind of estimate of how many FLOPs our network is. If I can do 2 Integer operations in one clock but only Floating Point operation per clock, you can't just say my 8 million integer operations per second are the equivalent of 8MFLOPS. Some hardware can even do 4 Integer operations in the same time it takes to do one single Floating Point operation.
Edit: For hashing, the proper network computational power unit is MIPS instead of FLOPS.