We've covered how to add a retractable dock to your cabinet, but if you have an extra 1st generation iPad and you're looking for a great way to have an infotainment system for your kitchen consider permanently mounting the iPad in your kitchen cabinet door using an idea from furniture modfication weblog IKEA Hackers.
The author cut a hole in their kitchen cabinet door using a padsaw and carved out an area for the dock connector. A front frame for the iPad was created from pieces of aluminium T-profile trim and a hinge keeps the iPad in place. Finally, a path for the charging cable to an outlet was laid out with cable holders.
If you have custom-made cabinets you may want to skip this one if you're not confident in your woodwork, but if you use standard cabinet doors that are widely available you shouldn't have to worry too much about ruining your cabinet.
iPad Flush Mounted in Kitchen Cabinet [IKEA Hackers]