List of websites to learn Tamil Grammar:
1. Tamil Virtual University grammar courses
2. Books on Tamil grammar listed at Viruba.com
3. Tamil Wikipedia grammar guide - Has relevant links, guides for understanding essential Tamil grammar.
4. http://ilakkanam.blogspot.com – A team blog in Tamil answering common questions / doubts on Tamil grammar.
5. அடிப்படைத் தமிழ் இலக்கணம், பொற்காலத் தமிழ் இலக்கணம் – Free e-books for download from Noolaham.net.
7. Tamil grammar through English – A simple beginner level presentation in English to understand basic Tamil grammar.
8. http://www.pudhucherry.com/pages/gram2.html andhttp://www.pudhucherry.com/pages/gram3.html teach you about சந்தி இலக்கணம். i.e, when to add க், ச், த், ப் in between two words when you write them together. Guess this is the number one confusion for any tamil writer 
Related posts:
* Tamil literature magazines websites
* Tamil ebooks download websites
{ 3 comments… read them below or add one }
We have to select good tamil teachers to develop tamil langulage. Most of the tamil teachers are using tamil bazar notes to teach tamil. Using tamil notes should be avoided. Students memorisng as it is from the notes and the teachers are awarding 100% marks. It an idiotic system.
I am teaching tamil.So far i am not encouraging my students to learn from tamil bazar notes.Instead I encourage all my students to create and write own answers.
Nice&helpful