We've been saving the seeds of our basil plant for about 2 or 3 years now. The plant we have now is the grandchild of our first plant. It looks like the most amazing basil plant I've ever seen. It's so vibrant, strong, tasty, attractive. And it has just flowered, so we can keep this line forever.
Save your seeds people! If you grow anything and you're not saving seed, you're an idiot.