In the past, small businesses have often had to compromise when it comes to choosing which company to use for their web site hosting needs. They could either choose to play with the big boys, and pay a premium for it, OR save money, use a smaller hosting company, but often find the reliability of the servers they were using reflected the price difference.
However, Concentric believe they have found a compromise that has the best of both worlds.

As a premium quality shared hosting provider, their prices are low, however because they use multiple clusters of servers for their clients, their uptime is very impressive. Should you require your site to not share server resources with other businesses, they can also meet your requirements. In either case, the use of multiple servers means that should one individual server suffer some down time, your site will still be available via one of the other servers in the cluster, so your customers will not notice anything has gone awry what so ever.
Right now, if you decide to use them for your hosting needs, you will find you get a free domain name registration, as well as one hour of free consultation!