Chobits,Air Gear and Love Hina are the ones with the most ecchi I've ever seen

hmmmmm
1) vandred
2) love hina
3)Eikken FTW (i have never seen a more sexual related show)

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"gene's brother was an only child" peter chriss (kiss meets the phantom)
"lol wait what just happened?" Me after watching kiss meets the pantom

Try:

Kanokon
To LOVE-ru
Amaenaideyo
Girls Bravo
Rosario+Vampire
Ichigo 100%

Ikkitousen
Club to Death Angel Dokuro-Chan
Kamen no Maid Guy
Burn Up Excess
these are just a few off the top of my head

Alot. Too many for me to want to go and list them all. I like them.

The best ecchi serie I have seen is Girls Bravo.
Fukuyama is just so damn hilarious

for me.......nothing beat kamen no maid guy.........
although this anime got some sort main storyline (protecting inheritance), most of this anime is talking about boobs!!! boys obssess with boobs....fighting for boobs.....dieing for boobs.........girl jealousy with big boobs.........boobs dilemma.......big boobs advantages disadvantages.......
boobs shape also nicely drawn.........BOOBS !!!

Love Hina, but Ranma 1/2 is the best

I'll keep an eye out for this one.

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I don't think chobits,love hina,ranma 1/2 ,onegai sensei are ecchi...

I mean there are certain perverted scenes but then when we compare them to green green for example
they are hardly ecchi..

If u do not know the difference between Anime and cartoons. U better find out!!!