i hate the 30 min naps, where they wake up still rubbing their eyes. we had that yesterday when we went out to lunch for DH's birthday and tried to get him to sleep in his cot.
tibs, about the nap timing thing, i've actually found having set nap times has really helped. it helps me know how to plan the day and when to put him to bed, and i think it helps LO know what is happening to. i seem to have found the right timesto put him to bed, so hewill go to sleep quite easily 9 times out of 10 (if we are at home).
anyway, i took my cues from weissbluth's book (ah the horror!), but i think he is quite sensible about naps. i put LO to bed around 8.30/9 and 12 and then have a flexible afternoon nap starting between 3 and 5. theoretically the afternoon nap should be the one they drop first, and keep 2 naps for a while, with the midday one pushing out to around 1pm or something. then eventually the morning nap goes and the midday one stays for a bit longer.
i still try and take cues, but will also keep LO up until the proper naptime, even if we have to fight a little tiredness.
remind me your LO's age, and i can look what weissbluth says for that age ifyou want.