EDIT 2/10/2011:
Sword Art Online
Just recently, sword art online, a light novel which i have also have been reading, has been green lit for an anime...you can read it here
Boku wa Tomodachi ga Sukunai (OVA and Anime)
- nice art (same artist as Denpa Onna to Seishun Otoko)
- funny (my sense of humour)
- pretty girls
- no continous plot (in the manga)
- plenty of other forms of media (translated audio cds, manga, light novels...)
- many notable voice actors
- harem
- stereotypical, and yet likeable characters (male protagonist is a bit of a kyon)
Sankarea (Anime)
- nice art (same artist as did Kenkō Zenrakei Suieibu Umishō otherwise known as Umisho, which also got an anime (and which I've also read))
- pretty girl(s)
- nice plot
- romance
Nana to Kaoru(ecchi OVA and live action adaptation)
- investigate (by) yourself please.
Games which had no anime at time of playing but have an anime now:
Persona 4 (Anime)
- awesome music
- enjoyable characters (may change in anime adaptation)
- only played half, so cannot comment on story
- don't talk to people who have played the game, they will massive spoiler you.
Sono hanabira (short, adult OVA)
NO SEX VERSION BELOW (is why it's only 8 mins):
- yuri
- some character development but mostly sex. play the games for the 'plot'
- investigate (by) yourself please.
Anime which didn't have a sequel at the time I finished them but have a sequel now:
- Darker than Black (i didn't like the sequel though :S. still haven't watched OVAs)- Working!! (sequel: Working`!!)
- Bakemonogatar (sequel: Nisemonogatari. Prequel, Kizumonogatari, also being adapted as a movie)
- Shinryaku!? Ika Musume
- Nyan Koi! (although not sure if i'll actually watch the sequel)
- more like Shakugan, hidamari, fate series not listed as sequels were expected.
Next time, look out for 'anime which do not have sequels but which should have sequels'.
