I use Rails 3.0.x; gmap4rails and geocoder for mapping stuffs, paper_clip for uploading files. meta_search, meta_where for searching. Some of my favorite gems too: Devise for authentication system, formtastic for forms, jquery-rails for using jQuery instead of Prototype.
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Senior Rails developer for 4+ years. Very familiar with Rails 4.x, 3.x and even 2.x, Backbone.js, Bootstrap, Compass, CoffeeScript, jQuery/Prototype, HAML, SASS, Facebook / Twitter / Paypal API, MySQL/SQLite3, Git/SVN, have experiences working on Joyent Node.js, Linode server, Github, Heroku, deploying Rails app to Bluehost, GoDaddy, Justhost... My slogan is "Precision, Reliable, Fast"
Some of my favorite gems: Devise+Cancan+Omniauth (authentication), jquery-rails, formtastic, meta_...