I think having two titles is a bad idea. To have 'IMSLP/Petrucci Music Library' on the front page is unwieldy, and potentially confusing for newcomers.
Make it as simple as possible. E.G. Wikipedia isn't called 'International User-Generated Encyclopedia Project', 'IUGEP', or 'Jimmy Wales Factual Library'.
Personally I don't like either the long-winded collection of initials - IMSLP - or the commemoration-title using a person's name who no-one's ever heard of - Petrucci Music Library. Unless someone can come up with a better title for the whole thing, though, I think it's best to use one and lose the other.
I think it would be a lot better if the home page of imslp.org went straight to the page of the wiki rather than the branch to the forums and whatever else - after all that is the main thing, and what most people are looking for.
Above all though I think this website is one of the best things on the internet, on a par with wikipedia, youtube and so on as a great thing we could only have because of the internet - and I'd like to see it as welcoming and easy to use as possible so it can be as strong and successful as possible. Many, many thanks to everyone involved in this website and best wishes for future development.
