I've included a section for voicemail because some of the visitors here are starting their own business and voicemail is a popular need for them.  We're working on a voicemail comparison guide but that's not ready yet.  So instead I will give you a couple of the best basic options.  All of these are excellent services and are probably better described as virtual office services, since they can forward and screen calls and give you a lot more than basic voicemail.   Smartvoicemail at $4.95 per month, is probably the least expensive but still very feature rich.  It's run by a small but aggressive company.  See SmartVoicemail.com Freedom Voice Systems is probably the most popular, having a very large distributor base it's sold under a variety of names.  It's a very professional system and my brother uses this for his site Premium800.com   They have a good website at FreedomVoiceSystems.com Ring Central is the service that I use for this site.  They have a great sign up process that walks you through the whole setup, and they include a lot of extra features.  They are also the best for high volume applications because of their $49.99 unlimited option.  See 1800RingCentral.com TeleCenter Voicemail is a great service if you mainly need incoming calls for announcement or voicemail programs.  It has a lot of features, but you get unlimited incoming calls for only $35.95.  See TeleCenterVoicemail.com 1800VirtualPBX is an industrial-strength, full-featured business telephone system similar to high-end PBX and business phone systems in common use but it's an inexpensive monthly service.  See 1800VirtualPBX.com

I hope that gives you a good idea of some of the best voicemail options.