I have several S-Ranks but have never bothered to try doing it on Playstation 3.  The trophies always seemed way less interesting to me so I tended to simply play the game and stop when I finished.  Today, I achieved my first Platinum Trophy with Infamous.  Overall, it wasn't too bad, only having a few annoying ones like the stunts and high fall kills that made me grind some missions over and over until I got them.  
 
The final trophy I had to get was the Blast Shards one and it started out really fun.  I went by sections and pinged the map like crazy, eyes peeled for blue dots.  When I finished my own sweep, I had roughly 320 of them.  I wasn't crazy enough to seek the rest of them out alone and looked for a map showing them all.  About an hour later, I had swept the whole map.  Saving my game, I checked the count of Shards - 349 out of 350. 
 
I couldn't help but laugh, knowing that it had to come down to this moment.  Following some advice off of Infamous forums, I printed a copy of the map and searched through again, crossing off each and every one as I checked for it.  The Bombcast kept me busy as I poked around again for two hours.  Crossing the last dot off my map, I was sad to see that I hadn't managed to find the last Shard after searching the location of EVERY one of them. 
 
Combing the whole city again didn't feel like an option, at least not one that I wanted to attempt.  I frantically read some message boards, looking for tips on people missing that final shard.  The first tip I read mentioned a very tall building near the bomb site that had a Shard at the top.  This Shard wouldn't reveal itself until you were most of the way up.  Eagerly, I made my way to the building and started to climb, holding my breath the whole time.  I pinged the map and the beautiful last dot appeared on the minimap.  As I collected that final shard and got my Platinum Trophy, I couldn't help but think "Now I have to do this again in Infamous 2..."