What is your preferred method of...

PPC and squeeze pages don't work well together, my favorite method?

Article and video traffic

Article and video for me as well. Also social media serves me well to.

What is your niche?
I find that I've had success with some free ads like adlandpro.com and usfreeads. These also are regarded well by Google, so these also act as links for SEO.
I do prefer SEO and there are right ways to do that. It is also time consuming, and worth the while. Just have to be patient with that.
Adwords, I don't like it right now. Google owes me money because someone hijacked my account. It's been 8 weeks and counting. They've given me the run around.

I've never had any situations with Yahoo, Adbrite or Bing. Have you thought of finding a related site and buying ad space? There are some cheap ads that could make you some money. And it may be cheaper than Adwords. Banner ads are better, I've found.
Hope this helps.

I've used Adwords before didn't bring whole lot of subscribers but submitting articles to article directories worked really good and also blog commenting as well. My suggestion to you stick with the SEO metthod though.

Blog Commenting

My personal favourite for driving free traffic is blog commenting (can I hear groans), I find that hardly anybody does it properly.

One well written relevant comment can bring you hundreds if not thousands of subscribers as well as having the added benefit of giving you a back link to your site (sometimes)

I am going to generalize a bit here because I don't want to give away my exact blogs but search in Google for the top blogs in your niche and make a list of the top ten.

Then subscribe to these blogs, when the owner posts you will usually get an email notifying you.

Get to the blog and leave a GREAT comment, try and be in the top 5.

If you have left a comment that is really helpful/controversal/offering a different point of view then you will find a lot of people will click on your link to read more about you.

An example, if you are in the IM niche and Frank Kern does a blog post the majority of people will scroll down a little to look at the comments, the majority say something like 'love you Frank, everything you say is great' so you skim to the next one.
What if you had a post that said something like 'great info, thanks, I have just written something similar but while it agrees with most of what you have written there are some additions'.

How many people do you think are going to click through?

Doesn't matter if it's a nofollow your not after the link!

I would rather have a good percentage of Franks marketing efforts than 100% of my own. (I'm lazy)

There are guru's in every niche.

Kind regards

John