Everyone is going to tell you it needs to be a relevant, high quality, custom made post. It will help the comments stick better, and although it takes more time, its definitely the way to approach blog commenting.

Now, there are other ways of commenting that are a bit more "advanced", and blackhat, but not something I'd recommend on this forum. =]

For instance if all the blogs talk about the same topic, you can technically try writing 20-25 "high quality & relevant" comments, associated to the niche, then spin them on a few 1000 blogs, using a linkwheel and not linking directly to your site. You can still get a fair amount to stick, and if you set it up right, you can still get traffic.

But there are far too many variables I haven't even touched on, like competing with Big G's new algo's. And honestly, this is stuff that should be talked about in the SEO forum. Actually, no, it shouldn't. This is just blackhat. If I was you, if you're not sure what you're doing, do everything the "right way". As time goes by, you might learn a trick or 2. But in these days, the less you game the system, the more sustainable ALL your efforts wind up being.

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