I think it's around $1000. If the car isn't under warranty and you don't have to have the dealer do it, you do it yourself. I did the 60k service, front pads, an oil change and fuel filter for around $350 and a wasted Saturday. It really isn't that difficult.
I haven't gotten to 60k miles yet, but the 30K and 60k service are very similar. I paid about $700 at the dealer for my 30k mile service and did the cabin filter myself (which saved $100), but I have heard most dealers charge about $1000.
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1999 Ocean Blue Metallic Boxster - blueboxster.com