Instructions:Just put 'DEC09' in "Enter coupon code" field and ensure you have chosen the '30 mbit (3 maanden/months) (Euro18.50 for 3 months)' product in the "Membership Type" field.
This is for previous customers only, but I am sure you could in theory sign up for 1 month then use this code. Bare in mind Hitnews is only a viable alternative to some of the other Usenet providers when you take advantage of the 'Account sharing' ability.
For example you can get 6 people on a 40mbit for 1 year account, each person will have 6.5mb(ish) of download speed, 2 connections, SSL for a whole year at a cost of £12.50 - yes that is for the entire year not monthly.
Bare in mind though that this only works with some ISPs due to the way traffic is routed through Europe.
As far as I am aware these ISPs are compatible with Hitnews:
Be, o2, Virgin, Sky.
This may have changed now, but other than trying someone elses account and seeing if you can connect it is hard to know.