:) as you can see, I didn't have time to go through all the quotes I scraped. We ended up with over 300,000 quotes and chose to use the top 1000 to start. What I find even funnier is that this was highlighted on the kindle by 980 people!
I think you should keep it in, instead of filtering it out. It will make the site feel more authentic, and the out-of-place quotes can become viral (in the sense of "no publicity is bad publicity").
I'd also humbly offer two enhancements:
1) Create widgets that other sites can place on their own web sites, linking back to yours.
2) New daily quotes could be published via RSS. (For example, I don't see myself visiting the site more than the initial one, but I can imagine someone putting an RSS feed into his daily reader to spice it up.)
http://quotab.ly/792/solitaire-for-kindle-vol-1