You shouldn't just expect aggregators to simply include your blog. If you have good content, then people will pick up on it. irishblogs is just one aggregator, and is probably not ideal.
Most people are a bit prudish (even unconsciously), so would feel uncomfortable reading their daily blogs to be suddenly confronted with pornographic material; even if it's just text.
As I said, if you have good content, people will pick up on it and start linking to it. Maybe irishblogs won't aggregate it, but something a little more specific to your field will most likely pick up on it.