Just got the following e-mail:
News has been spreading on Facebook today that all books at
Springerlink from before 2005 are now freely downloadable as searchable pdf files. […] You can do various kinds of searches — there are relevant ones in psycholinguistics, language acquisition, natural language processing, as well as philosophy, semantics, syntax, morphology, … Try starting here, then change the search as you wish. No one knows how long this opportunity will continue. […] But it’s a great opportunity while it lasts.
Update (Dec. 30): The promo/mistake seems to be over, but it was fun while it lasted.