WhatPC have made an overview article and review about Ubuntu 6.06 and free software in general.
Read it here
After a short delay, Ubuntu 6.06 (Dapper Drake) was released in June. Originally scheduled for mid-April, the developers decided to let the date slip six weeks to allow for concentrated bug fixing and some final polishing.
The previous version, 5.10 (Breezy Badger), was immensely successful, and Dappers release was, not surprisingly, long awaited.