I'm lucky enough to work near one of the Rasa restaurants so I can sample the food at lunch and the recipes in this book don't disappoint. The book contains lots of Keralan cuisine (so a bit different from your usual Indian recipes) that may be familiar to you or may not but is definitely worth eating. There's lots of vegetarian dishes but far from exclusively so and the spices tend to focus on cumin, turmeric, black mustard seeds, fenugreek and cinnamon with coconut making a big appearance too. If that sounds your thing then crack on.
** edit 5/11/2010 I originally gave this 5/5 and the above review. After cooking a few more dishes though I've found the liquid quantities on some to be way off, namely the tarka dal and onion pakora where I had to use around half the amount stated. As such I've knocked a star off, it's still a 4 star book for the diversity of recipe. Use a bit of common sense with the recipes and add liquid slowly, if after half the liquid is added it's already the right consistency then don't add the rest.