Spent some time over Christmas enlarging a short guide i put together on autographs for investment for a magazine.
I get asked more and more about this subject, and now have a number of customers who are buying purely for this reason.
One thing i would say which i think we all know anyway, is that when you are looking for future investment potential, you should ignore your own personal likes or dislikes. As an example, not everyone will buy a Maggie Thatcher signed item, simply because of their own thoughts, which is madness as she is one of the best investments you could make at this moment.
Please take a look at the article, its here on eBay, do let me have some feedback, and please do vote at the end.
This forum would also be a good place to make your own suggestions as to future investment signatures.
http://reviews.ebay.co.uk/Investing-in-autographs-a-beginners-guide?ugid=10000000164884294