There is a ROM on XDA for the Captivate called DarkKnight (4.0.4-based). It's been running rock solid on my Captivate for the last few weeks. ROM is stable and battery life is great. Got almost 40 hours on a charge with moderate usage.

Actually, yes it has. On Android say "Note to self, pick up milk after work" and you can send yourself a reminder to your Gmail.