We have been using Unix and Linux for more years than we care to remember, both for work and for our personal PCs. With one exception (our Windows test box) all our servers, desktop PCs and laptops run Linux. Even Paul's PDA runs Linux.
At various times we have worked with various flavours of Unix and Linux distributions from Slackware, Debian, SuSE, RedHat, Gentoo, Ubuntu and Kubuntu. Currently we use SuSE, Ubuntu or Gentoo for our own servers and Kubuntu for our desktops and laptops and we support customer servers running Gentoo, Ubuntu and RedHat.
We are active members of the Cambridge Linux Users Group, and we subscribe to various Linux and open source lists and forums.
Unsurprisingly if you need help with system administration for your Linux box we have all the skills you need. If you can give us SSH access we can be online helping you in minutes. We are used to setting up servers to provide the services you need for example an apache web server or a postfix mail server but we can turn our had to pretty much anything.