Next Steps? - Product Review (Amazon site)
Before I ask my question, I want to thank the Warriors for all the info posted in this forum. Have picked up some great tips and advice from you guys!
I have another question(s) - all posts are welcome

I have a product review site based on an electronics sub-niche. I review products within the niche and have links that go to Amazon.com only. I have around 30 product reviews - I can't write any more until new products come out, unless I start reviewing older products, but would maybe be wasting my time with that.
I have created some basic videos on YouTube that point back to the product review page on my site. I get a little traffic from this.
I also have been answering questions with useful answers on Yahoo Answers, without being spammy. I get a little traffic from this.
Most of my traffic comes from Google.
All-in-all I get around 250-300 visits per day from all traffic sources.
I make about 150 US dollars per month. Not great, but it's a start. Now I want to build on it. Doesn't have to be Amazon, but want to multiply the income.
I don't have any Adsense as I'm not sure how that would affect sales (I guess testing would find out!)
I also don't have a list. I'm not sure that once people have purchased said product within the niche that they would be interested in signing up for a newsletter etc. Perhaps I'm wrong?
I do have some ideas however:
1) I'm thinking about creating a category that is based around my product niche. I could write lots of content based around the technology and some 'latest news' I guess. I was thinking about writing these articles and then adding some affiliate links or maybe Adsense to these posts and capitalising on this.
2) I was also thinking about using Facebook to drive traffic, but am not sure how many fans I would get based on a product type that once the user buys - wouldn't be interested in any more (in my eyes anyway). Also, I wouldn't say that creating a fan page based around my site name or product would be a particularly cool thing to 'like'.
Do you guys think these are good ideas? Are there other ways to increase traffic and sales? Or should I just leave this niche as-is and move onto another website and add product reviews as and when they are released?
I hope I am making sense, lol. I know I should just test really, but if you guys have already tested with or without success, I'll save some valuable time (you never get it back, haha!)
As I said, all opinions welcome - thanks in advance, Warriors
"Opportunity is missed by most people because it is dressed in overalls and looks like work." Thomas Edison