how do you market via blogs

You can market either with your own blog or through other people's blogs. Blogging yourself is a great way to maintain a conversation about your product and/or the industry. Make it interesting from the readers perspective, not everyone is in to your product, help them get there. Downside: you have to blog regularly, weekly or more is best, anything less and there is not much reason to come back.

Blogging through others is more effective, because a third party is validating your business or product. Find the most influential blogger in your market and let them know about your product, if they do a piece, you have instant validation among a large audience.

Either way, quality content is king, make your posts enjoyable and your posts with have impact.