I like it because I can add the blogs I like to read to my feeds. When those blogs are updated, then it lets me know. That means I don't have to check the blog daily for updates. When it gets updated - whether it be hourly or monthly, I can see it in my blogline feeds.
Anyway, I recommend it to anyone who likes to visit several blogs often.
The other nice thing is blog clippings. Now I read a lot of knitting blogs and get ideas of future projects from other bloggers. Well it gives you the option to save one blog entry - which I am using to save, all those great knitting ideas!
So, ther you go, there's my plug for Bloglines