Fuel filters are scheduled much more frequently see manual - about 10-15K miles at the very most IMHO.

Serpentines typically can NOT slip due to the constant pressure the tensioner keeps on them and was one of the main reasons manufacturers switched from the old slippign v-belts of old.

Timing belt can't slip since it is cogged or if it did, you wouldn't be driving! Engine is NON-INTERFERENCE so if you put it off and it goes, it won't trash engine but again you won't be driving. Water pump and timing belt tensioner are must replacements when doing the timing belt. Oil pump can also be replaced at this time I believe and is a good investment.

Replacement procedure is documented on the Workshop CD (downloadable from my site) but is more than I would be willing to do - a LOT of things have to come off the front of the engine and an another member has already found out the hard way, it the belt is not put on correctly (even ONE tooth off), everything will have to be dissassembled AGAIN to resolve it. If you have replaced timing belts before, should not be a problem, but definitely NOT for the new do it yourselfer.