SEO Related Affiliate Programs?

Recently, I decided to start putting banners on my blog (http://www.slightlyshadyseo.com) to SEO-related goods. I'm looking for good things, especially software, to advertise for, and I'm drawing a blank(the SEO world is full of spammy, crap products).
So I'm looking for input on what to advertise. Anything you guys have had good experiences with is welcome, except for the things I specifically exclude below, or the niches I'm already advertising.
What I'm already advertising:
Wordze- Keyword Finding software. I like it more than wordtracker
1and1 - Hosting, but primarily domains.

What I refuse to advertise
Spammy looking single page "sales letter" kinds of software.
EBooks. I hate ebooks, and they're a ripoff.

So anything you guys have, especially software, drop it in this thread. If it's a 2 tier aff program, feel free to instead PM me your affiliate link for it, and I may just join. If you do that though, please reply here also, saying PM sent.

Thanks
-XMCP

 

SEOElite is a good one too. It is not my product but a good one you should include.

 

Ok, I'll take a look. So far I've gotten reccomendations for that, and spyfu. And actually, I prefer it's not your product. That way, I'm getting less biased reccomendations.

 

I was looking fror some too will check this thread again for more developments

 

Ok. Extra question. I hesitate to do this, because I don't want people to stop offering up products that worked well for them that have affiliate programs, but also,
Do you guys believe advertising for more than one product inside of a niche is worth it? I'm afraid it will show less confidence in the first product, but at the same time realize the benefit of showing more than one product, in case they didn't like the first. It also would help to limit people going blind to the ads because they got used to them. And example would be, would it be ok to advertise both wordze and wordtracker?
But yes, keep the affiliate programs rolling in too.