I've been enoying the two on PSN/XBL a lot of late. It's great to see that same gameplay/style in HD so things don't look heaps dodgy like the old games themselves do on newer TVs.

My favourite of all time though is probably Megaman II which coincidentally is also the only to appear on iPhone/iPod touch much to my pleasant surprise. They strike me as being one of the more difficult platformers back in the day and because of it they were also more rewarding to finish.