I've set up a small niche computing museum dedicated to the creations of Sir Clive Sinclair and companies that worked with him such as TIMEX and several others. During the process we realised we were the first museum dedicated to the ZX Spectrum computer (as such computer was Sir Clive Sinclair's most recognised invention).
Many people from my generation (I was born in the 70s) in Europe consider the Speccy a symbol of our generation as many of us went to careers in IT because of it.
I'm no Paul Allen and this all started as a private collection that I decided to make available to the public in collaboration with a city hall in Portugal.
We avoid as much as possible loans. It's a nightmare to manage them so we explain that to our donors and only accept loans of unique things that we cannot find and buy.
We do not - at least for now - sell objects. We can exchange them with others to enrich our collection though - it has happened two or three times.
I do think a lot on how to find a way for the museum to survive me. The first key thing is to find a business model. We are a free entrance museum so we had to find ways to do activities using our collection to generate funds that we can reinvest. I am not sure if this will work, but we are trying really hard.
Our museum is called LOAD ZX, it's located in the centre of Portugal in a city called Cantanhede, close to Coimbra.
http://loadzx.com/en .
You have lots and lots of information on our work online.
Drop us a visit when you are in the country.