Back today from another trip to Oxford.
I attended the ACCU conference at the Randolph Hotel, which this year included an "Open Source Forum" as an extra track as well as the Python Conference which has run alongside the conference since 2002.
Eric Raymond was the keynote speaker opening the whole event. Other highlights were the Open Source panel discussions on Wednesday (Malcolm Yates from SUSE was on the first one and I was on the second), the software patents session and Alex Martelli's Python talk on Friday.