Write regularly, neither too often nor too rarely. Two to three blogs a week is a good frequency to maintain.
Don't just type, talk to your audience. Blogging is way big a market on internet and people will like you if you do more than just providing information. Suggest, express, appreciate, criticize and have an opinion to build a relativity to a like minded audience. Make them feel that their visit to your blog matters to you.
An interactive style of writing will help you gain readers, but steer clear of SMS lingo if you want to be taken seriously.