I’ve sifted through many contact form plugins for wordpress. Luckily you don’t have to go through the nightmare of trying them all out as I have done it for you!
The best, most customisable I’ve found is available at delicious days (great recipes there too – in case you get peckish during installation). A huge menu will appear in your dashboard with a gazillion options for contact, subscription, ‘tell a friend’ and upload forms. It looks quite daunting at first but you can ignore all the parts that don’t concern you and the instructions are clear and concise.
You can see one of their forms in action here (please feel free to leave me a note…).
The usual procedure – ftp into your wp-content/plugins folder and activate on the plugins page of your dashboard…