Contrary to the general opinion here, I've been doing a good number of online transactions for past 5 years ... not a single time have I been duped. Not a single time has my credit card been overcharged, not a single have I regreted online transactions.
Like every side has a coin, with a little vigilance and prudence, you can enjoy the brighter side of online transactions.
I've even received payment using Paypal. Thought that's not my preferred mode (wire transfers are faster), but I wouldn't say it was a bad experience.
At the same there, like Paypal verified, a community called Paypal Terrified co-exists :-)
Personally, I'd salute the IRCTC site for providing such a rock-solid application that helps us book our tickets and get them delivered at our door-steps. Its a better option than paying those touts.