Hi there
I see you already had some advice and support here, I totally agree with the pps that your LO WILL eventually go to sleep without crying. Up to around this point your Lo has been focusing on how to sleep at night, from here up to around 6 months he will be working out how to do it in the day. At around the 6 month mark many LOs nap much more easily. This doesn't necessarily mean that your LO is going to cry until 6 months though, nor that he will never cry after 6 months
It looks to me like he is protesting (very loudly) about not being ready for sleep yet. I would extend his awake time. I know it is hard to judge an A time when you have the crying and fighting sleep to factor in but try to aim for more like 1hr 20 or 1hr 30 (in your EASY your first A is only 1hr, he is likely UT).
http://babywhispererforums.com/index.php?topic=64158.0You could also experiment a little with wind down times. Tracy suggested 20 mins wind down to get LO nice and sleepy and calm before putting in the cot awake, my DS liked a 2 min wind down and any more than that and he'd kick and scream blue murder!
Many people like to persevere with a nap once they've take LO to the bedroom. I found that very very hard going at times. My LO was already an independent sleeper but when his naps went off track and the screaming started...well, I KNOW it's hard! They can also cry for so long they end up OT too which doesn't help matters! So, something you might try if the crying is going on and on is to take him back out of the room, this may distract him out of his crying which they do seem to lose themselves in. After a few minutes of calm cuddles you could go back and try again.
And honestly, the day you put him down, awake, calm, drowsy, and he smiles that beautiful big smile at you as you say goodnight, well, THAT will make up for every single moment of hard work you put in. You'll smile back and leave the room and he'll close his eyes and go to sleep. I swear when that happened to me I thought I would burst with the love I felt!