Yes, there is. You can watch in here:
http://www.gogoanime.com/to-love-ru-darkness-episode-1
Chat with our AI personalities
Most popular anime streaming sites will have the subbed version for the series.
To Love-Ru's title is a word play. It means "To Love You" and when pronounced in Japanese it sounds like the word "trouble" (to-ra-bu-ru).
You can watch it on dubbed anime in Japanese
There is already an OVA of To-Love-Ru which aired from Apr 3, 2009 to Aug 3, 2009. The second OVA was announced and will air from Nov 4, 2009 to Apr 2, 2010. http://myanimelist.net/anime/6732/To-LOVE-Ru_OVA_2
At myanimelist apply the filters for romance, comedy etc and browse through the database at your leisure.