One more update: Here is a link to a site that has some very nice SEO themes free for downloading. Looks as if my 8 top wordpress theme download sites has turned into 10 Top Wordpress Download Sites. 
Vevin.com
Update: Here is a last minute add-on for an individual theme. It is Thesis Theme and it is sporting 3 columns with great support/updates. An SEO theme. Visit the link below. Thanks again Patrick.
Thesis Theme (this is NOT a free theme download)
These are my top sites I pick for finding quality Wordpress themes. I love to look at themes for Worpress. Not just any themes for me though, I am hung-up on 3 column themes and I guess I always have been. But of course, not everybody is like me. I have bookmarked several sites that I found worthy of sharing with you that offer a good range of Wordpress themes that include single, 2, and 3 columns. Some are SEO themes and most are widget ready.
I hope you enjoy the sites I am sharing with you. This site itself is up for a theme update. Just trying to figure out if I want to spend the time making one myself or finding just the right one that another person has lovingly taken the time to make and offering to us for download. Always be sure to honor a theme maker by leaving the designer link in tact.
Diva Geek Designs has a nice collections of high quality themes with some I had not seen before. The have 10, what they like to call, Bling Bling Themes. They have recently added several “dark themes” as well and they are very nice. Diva Geek Designs is a free online resource for designers and developers.
I love this one. Site Ground (dot) com is a web hosting company but their design team has created some pretty neat professional Wordpress themes. They seem to be of nice design and high quailty. Impressive. Take a look! Also, while there, why not check out their webhosting. No, I am not affiliated but you never know. Could be something you would need.
This is Top Wordpress Themes and they have a pretty good collection though I don’t know that I’d call it the top ones or not. I still like their site all the same. There are quite a few to gander at and loving to snoop for themes, I enjoyed snooping through theirs. There are some that I would call “adorable” and I love adorable. 
I love Smashing Magazine and I really like their collection of themes. Be sure to stop by and see what they are offering you in the way of Wordpress themes. There are tons of themes there. Like more than 100 of them.
No thumbs for these websites but not because they are any less great, I just got lazy making the thumb images. ha! Enjoy!
Wordpress Theme Directory Of course there is the Wordpress Theme Directory. It has been revived and updated and is coming along nicely. New themes are being added everyday.
Free Word Press Themes claim quality, free, themes and I have to say that I found several on there that, did I have the right niche site, I would just love to use. Kids Wordpress theme, so adorable, and green type “Fern Theme” that is just gorgeous. Take the time to go through the pages of themes they offer. I’ll bet you’ll find something you’ll just love.
WP Theme Spot wow! Check out that Notepad Chaos Theme from Smashing Magazine. How lovely is that? Just beautiful. I am considering changing my current theme on 2 Tails and Co to this one. And it doesn’t stop there. WP Theme Spot offers many that you won’t see any other place without having to dig for hours.
Clazh offers two or three parts to their beautiful theme line-up.. be sure not to miss a part or page.
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Thank you very much for mentioning my site in your post.
Hope you find or design the perfect 3 colum theme.
You really have to dig the net to find the good themes. There is a ton of them out there but not all of them actually work like the demo looks or they’re not widget ready or they just don’t work at all…haha! So i try to find themes that look good and work good. I’ve either used or at least tested all the thems I post on my blog.