ChineseTime (http://www.chinesetime.cn) is the project I've been working on for about one and half years. Our goal is to build a website contains abundant Chinese language learning resources including self-study, teacher-led classes, and student community. Of course all these should be based on a nice, easy-to-use interface. Unfortunately the UI is not what we are proud of  - it's still a tradditional website where you won't see ajax or fancy javascript techs. But we did invest a lot of resource to develop handy tools for Chinese language learning.

1. self-study content: to distinguish our platform from other self-study learning materials, we built a sophisticated tracking system that helps students to know how they spend their time with chinesetime. You may use it with progress report to evaluate if chinesetime is really helping.

2. teacher led skype private lesson: this is the key part of our service 'coz it makes totally different to study with a well trained mandarin teacher directly from China (teachers majored in Teaching Chinese as a Second Language, and speak mandarin almost the whole time). We guarantee 24 hour response and teacher will be 24X7 available.

3. character movies: instead of animation or flash, we use real teacher to shoot every movie for every single character. we uploaded to youtube to share with everybody.

4. flashcard: it's a simple character lookup tool at the moment. you can search by pinyin, radical or the character directly.  It awill be a dict supports expression lookup as well.

5. pronunciation lab: text description and movies to give out clear tips on how to say finals and initials correctly. A nice tool for beginners and students wants to fix their pronuciation.

Of course this is just the beginning, we are developing more content and also improving the teacher-led class system like white board supporting, etc. And in terms of technology, we are looking forward to a more friendly interface.