Bleach, DGrayman, Eyeshield 21, Final Fantasy, Gundam Seed, Harry Potter, Hikaru no GO, Naruto, Wolf's Rain, and Yugioh.
Most are yaoi, though I think there are a few gag (Bleach, Final Fantasy, Wolf's Rain) and there's actually some beautiful Gundam Seed romance doujinshi by Tenshin Monogatari.
Also, still over 350 doujinshi available for sale on my site:
The site says over 1000 items, but most have been sold and their pages are still up for reference. So if there's no "Add to Cart" button, then it's already been sold.
If you have any questions, feel free to ask by commenting or you can email me:
http://www.nekotachi.net/us/contact_us.php (make sure your email is correct XD)
You can also contact me via AIM: nekotachi