Erm..to the creator of this thread..you said the OVERALL Easiest 99 Skill..but on your choices, you only take SPEED into consideration..
In my opinion, the Overall Easiest 99 is Cooking. You lose only a bit more money than Firemaking, but it's much more - as Zierro said - relaxed. It's click, select cook all, wait, bank, repeat.
Fletching is also like Cooking, only you lose less money. But, you get 100K EXP/HR via Yews at 70. That's not my information, my friend said this as an average. Then, he also said that you get over 100K with Magics, but you need to get to 85 for that one.
Cooking gets you 120K EXP/HR via Lobsters at 68 w/ Gaunts. It raises to 200K EXP/HR via Sharks at 92 or 94 w/ Gaunts. This is more EXP than Fletching.
If my above information is wrong..just don't even acknowledge it.
Cooking is the easiest skill.