I don't know of any third party services. You get WHOIS privacy from the registrar who holds your domains. ie If your domain is at GodDddy then you can only get GoDaddy privacy. Just about all registrars offer this service.
Well, privacy is rather limited now, but yes as tobycoke mentioned you may buy privacy from the registrar (and I do the same on pubdomains.com, if you register for 5 + domains, privacy options are free) Cheers GS
Godaddy privacy is good - I have it for my main site. Alternately, just get a PO Box for $50/year and list that as your address for your domains.
Namecheap offers Whois privacy for free for every domain you'll buy from them domains costs are around $9.29 and you'll get whois privacy for free.
Thanks guys, I'm currently on 1and1 and they do not offer domain privacy. I shall check out pubdomains as I have 5+ domains.
domain privacy is important, as indicated earlier each registrar can provide privacy service. some do charge for it and some include it in their domain pricing and promote it as free. check my sig (winkdomains.com) for transfer/regstration options. you get free privacy with 5+ domains on single order.