You can also upload your PhD thesis on ResearchUSA.org (Documents Archive) and set the permission according to your wish. If you have published all your journal papers out of your PhD research, you can upload the entire thesis there and make it public. If you want to share this PhD thesis only among collaborators, then upload the whole thesis there but make it private (you will be able to put a password - you have to email the password to anyone you want to have a look at your thesis - example - employers, post doc recruiters etc) . If you are still publishing journal papers from your PhD thesis, then you can upload a limited preview of your thesis at ResearchUSA. Just put the first 50 pages of your thesis there (Possibly contains Table of content, Literature review, background work etc, but not any results). I think this is a good idea because it improves the visibility of your research yet does not compromise the safety of your ownership. Also this portal connects your work to your CV so that people coming to your work through google search etc also get to see your CV. I personally like this website a lot. Scribd is also good but i am not sure if it is very research centric.