I was really surprised about this one, got a letter through the post from DVLA reminding me that my car's road tax is up for renewal at the end of this month (though I already knew). I was planning a trip to the Post Office in the next two days but when it said you can renew it online simply by entering your reference number I was thinking god bless modern technobabble.
Saved me a trip down town thats for sure, eventhough it only takes 5 minutes to get there. Yes I know I'm lazy, and if the internet progresses at this level I won't have to get out of the house. Ever.
Oh and here's the link before I forget: http://www.vehiclelicence.gov.uk/