First off VOIP is great!
There a few miths that need to be dismissed here:
[list][*]You don't have to have a computer to make or recieve VOIP calls - most VOIP providers allow calls to and from 'normal' phones and mobiles.[*]VOIP can provide savings in other ares such as calling mobiles - though the International savings can be quite good[/list]
Many companies such as sipgate (
www.sipgate.co.uk) provide users with a 'real' telephone number, in your own geographical area code (or one of your choice) so you can recieve calls from normal lines and mobiles. This saves costs on having an additional line put in (as you don't pay line rental) for business use or a line for your partner or kids to use without cluttering up the main phone.
My advice would be to check the tarrifs available on a few companies and then compare them to the calls that you make and see if you can make any savings. Obviosuly you will have to weigh up the cost of the hardware aganist any savings etc.
Hope this helped!