Yes, if it's still happening, let's do it! I really think it should be 'ibelieveyou.co.uk' or dotcom, whatever, rather than 'stoprape.com' as it's always better to keep to one, simple, clear, consistent message, and the 'I believe you' tagline really seems to be grabbing people.
This can then be stripped across all associated posters/ads/buttons - ie, "I believe you: over 90% of all rape allegations are true." Or "I believe you: senior police officers oppose anonymity for rape defendants." "I believe you: most rapists are known to the victim." etc
Also, sadly, if you name the campaign website 'stoprape' a lot of people will immediately switch off and turn away, whereas 'I believe you' is more likely to intrigue people and draw them in.
The bus advert idea was floated - I believe that the Atheist bus was funded by lots of members of the public donating a fiver each. It's fairly easy to set up a PayPal 'donate now' button on your website. Then it's just a case of PR effort to attract funding.
I'd also advocate cute button badges to be posted to celebrities, women's mags, etc. Make it as attractive and accessible as the breast cancer campaign.
Then, when we start gaining funding, start distributing info packs to teachers and sexual health educators.
And the focus should be on busting rape myths. If we bust rape myths, the treatment of victims and the conviction rate will improve.