I am sure visiting Wimbledon is mentioned in every guide book, but I want to comment on my experience of visiting Wimbledon last year (2005) to show that you do not need money, nor a lot of time to enjoy one of the greatest tennis events on the planet.
Every year their are always stories in the newspapers at the ridiculous prices charged for strawberries and cream and a drink of Pimms, but don't let these stories have any influence on your decision, as a trip to Wimbledon can be as 'cheap as chips'!
I was working in London last year while Wimbledon was playing and decided to go along with my girlfriend, even though the earliest I could finish work was at 4:30pm. I managed to arrive at outside of Wimbledon at 5:15pm, and it took another 15 minutes to reach the end of the general admittance queue, which was over a mile long.
Morale was very low at this point as I thought it would be hours before we would actually enter into the grounds, but I couldn't believe how fast the queue moves, and we only had to queue for no more than 30 minutes before we were inside.
The cost for general admittance was £10. This allows you to see all tennis being played apart from Centre Court and Court Number 1. If you want to see tennis on these two courts, you can go to a special booth (signposted inside the ground) where you can buy tickets for as little as £5 from people who have left early. This money goes to charity.
People who are leaving also give away their tickets and my girlfriend and I were lucky enough to be given tickets to Court Number 1 as soon as we arrived managing to see the British 'sensation' Andy Murray power his way to a big upset.
There was also a women's double match on afterwards, which we watched for the entirety.
So for the sum of £10 and entering the grounds at 6pm (after queueing for 30 minutes), we got to watch tennis on Court Number 1 and the outside courts for almost 3 hours. Not bad for an evenings entertainment, seeing one of England's biggest sporting events.
The first week of Wimbledon is the best week for doing this, as during the 2nd week, less tennis is played on the outside courts meaning that you will get less tennis for your £10 entrance fee.
More information can be found on the website: http://www.wimbledon.org
Ticket Enquiries: +44 (0)20 8971 2473.
The nearest stations to Wimbledon are Wimbledon and Southfields, with shuttle buses going from each to the tennis.