Capitalize on Web 2.0!

Use Social and professional networking sites like linkedin & facebook to identify candidates.

As already mentioned by others, use Google search

Use free Job boards & Free resume databases (try a search in Google, you will get a lot of websites)

Use technical forums to identify ideal candidates

All the best

Wikipedia definition for eRecruitment:

e-recruitment is the process of personnel recruitment using electronic resources, in particular the internet. Companies and recruitment agents have moved much of their recruitment process online so as to improve the speed by which job candidates can be matched with live vacancies. Using database technologies, and online job advertising boards and search engines, employers can now fill posts in a fraction of the time previously possible.

In practise we use the following eRecruiting options daily

Job Sites
Social Networking for Recruiting
Career portals
Search Engines for Job Search

In essence, eRecruitment is doing Recruitment through electronic format.