[mooreds]

Conferences.

Meetups.

Hackathons.

Reading books (google for "best software books" and you'll find some lists).

Hanging out in online communities whether general (like HN) or language/tech specific.

Read articles.

Follow interesting people/companies on twitter.

Blog about your work.

All of the above can help, but you need to pick what works and is fun so you can stick with it.