Workers’ Comp. is the line of coverage that has experienced the largest declines. It is also the most expensive coverage that most subcontractors have. One particular client of mine paid $2MM last year for WC and this year is paying $1.2MM!
Most other lines of coverage are flat with the exception of catastophe lines (i.e. earthquake, flood, etc.) due to the effects of Katrina.
I expect General Liability costs to come down for subs in the coming years as legislation that went into effect 1/1/06 has improved their vulnerability for construction defect claims.