One option targeted to the IT industry is Prior Art Archive. From their About page:

Low quality patents waste money. US companies spend millions of dollars year after year in litigation expenses defending against patents that shouldn’t have been issued. The patent examination process should stop patents from being issued on old or obvious technology. Unfortunately, just because technology is old doesn’t mean it is easy for a patent examiner to find. Particularly in the computer field, much prior art is in the form of old manuals, documentation, web sites, etc. that have, until now, not been readily searchable.

Massachusetts Institute of Technology (MIT) and Cisco have collaborated to create this first free and open archiving platform for the entire IT industry.

Simply put: fewer bad patents will be issued if we as industry give USPTO examiners the tools they need to find old technology.

I've had some issues creating an account, but I've gotten a response so I'm guessing its a work in progress.

One option targeted to the IT industry is Prior Art Archive. This article suggests it is being developed in concert with the USPTO. From their About page:

Low quality patents waste money. US companies spend millions of dollars year after year in litigation expenses defending against patents that shouldn’t have been issued. The patent examination process should stop patents from being issued on old or obvious technology. Unfortunately, just because technology is old doesn’t mean it is easy for a patent examiner to find. Particularly in the computer field, much prior art is in the form of old manuals, documentation, web sites, etc. that have, until now, not been readily searchable.

Massachusetts Institute of Technology (MIT) and Cisco have collaborated to create this first free and open archiving platform for the entire IT industry.

Simply put: fewer bad patents will be issued if we as industry give USPTO examiners the tools they need to find old technology.

I've had some issues creating an account, but I've gotten a response so I'm guessing its a work in progress.

Another option is Technical Disclosure Commons. From their FAQ:

What is Technical Disclosure Commons (TDCommons)?

TDCommons is a website that hosts technical disclosures from various different companies and individuals. Many of these technical disclosures are defensive publications, published for the specific purpose of preventing subsequent patenting of those ideas. Defensive publications can boost patent quality by creating prior art that prevents the issuance of overly broad or obvious patents.

What are the benefits of using Technical Disclosure Commons?

1. Free to publish. Cost does not have to be a factor when making defensive publication decisions.

2. Free to search. Anyone can search for publications on TDCommons - no subscription required.

3. Accessible through any search tool. The entire repository can be indexed and served using any search tool, including Google Patents, making it easier for patent examiners and the public to find TD Commons publications.

You do need to create an account.