>Google, the much used search engine also offer a book search facility. Publishers can make available online sections of books or even complete books for Google users to search. There is also a Library Project which makes available and searchable the catalogues of major libraries.
There are of course LGBT books available on the search; mostly academic works.
Click on the links below to see what is on offer:
Social Science / Gay Studies
Social Science / Lesbian Studies
Books about transgenderism
Books about transsexuality
Books about bisexuality
Google Book Search