I'm a member of a local TV database for my country and the site has few quite addicting features, so I decided to share it here
1. Here on TVRage we have a simple levelling, the site also has levelling but also a system of trophies. Each trophy is gained for something and has 6 levels.
As an example which trophies: amount of rated shows; amount of rated episodes; amount of time spend on site; amount of time spend in night (sleepy trophy); trophy per each genre (medical, action, crime, etc), major networks (HBO, Showtime, etc), major countries (UK, CZ, etc); visiting the site during christmas, new year, friday 13th, site birthday, etc; for taking Emmy awards survey who will win; amount of members visited your profile; trophies for site games... and tons more
When you reach a trophy level a funny friendly message displays for a moment. Each trophy is visually represented as an icon in a member's profile.
2. The site has few site games related to TV.
First is the Tradegame
. Based on a secret algorithm (popularity, bookmarks, i want to see, subtitles download, etc.) a price for each show is calculated every day. Each member has a starting credits and then buys shows and waits for a next day. Either his account balance increases or decreases. Only top 100 shows sorted by price is possible to buy. If a show gets off the top 100, the price is 0. There are statistics of successful members and trophies for it.
Second is the Postergame
. Every week is chosen a poster that is mosaiced in order to make it hard to recognize and split into pieces. The first day only one piece is displayed, the other day one more, etc. After a week, a correct answer is uncovered and original poster published. For the successful answer you get site credits and trophies. The sooner you enter the answer, and is correct, the more credits you can get.
3. A search for the Lost trophy
. The lost trophy is hidden in a detail of some show. If no one can find it a hint is published after several hours. If you find it you get a trophy and site credits.
4. Surveys of awards like Emmy or which US shows will survive the season. If you are successful, trophy and site credits is yours.
Note: Site credits are used to buy bonus features of site (like ability to chose a different tv show background than the one selected by admins as default for the month) or buy real gifts (t-shirt, cup, etc..)
5. And my suggestion is to improve site design. The logo is perfect.