Balesir
Adventurer
Lots of good answers, I have just one note to add:
At the time that Essentials came out, there was an intention to "update" the PHB1 classes in a "Class Compendium". The CC never appeared, but the class revisions for the AEDU classes were published in PDF and are available on the WotC site. Linkies:
Fighter (weaponmaster) here
Warlord here
Cleric (templar) here
Warlock (never got past "playtest") here
In addition, there were changes to racial ability bonuses (all races get one fixed and one choice between two alternates in Essentials) and feats that were rolled back to the PHB1 classes - they are available here and here, respectively.
Edit to add: it's worth taking a look at the "Rules Updates" section on the WotC website, too. Many changes were good fixes, but not all. I loathe the changes to magic items, personally, but it's still worth taking a look and deciding for yourself what to use.
At the time that Essentials came out, there was an intention to "update" the PHB1 classes in a "Class Compendium". The CC never appeared, but the class revisions for the AEDU classes were published in PDF and are available on the WotC site. Linkies:
Fighter (weaponmaster) here
Warlord here
Cleric (templar) here
Warlock (never got past "playtest") here
In addition, there were changes to racial ability bonuses (all races get one fixed and one choice between two alternates in Essentials) and feats that were rolled back to the PHB1 classes - they are available here and here, respectively.
Edit to add: it's worth taking a look at the "Rules Updates" section on the WotC website, too. Many changes were good fixes, but not all. I loathe the changes to magic items, personally, but it's still worth taking a look and deciding for yourself what to use.