Well, like the topic says there are 2 exploits on how to Level really fast in Ryzom. Ryzom has got a Level cap of 250 per genre and with this bug you're able to hit the cap IN ONLY ONE DAY !!!:!:

1.) One-Level-Per-Kill Self Heal 'Cheat/Trick/Exploit/Bug'
Horde a crowd of mobs around you, heal yourself (self heal Level 1 spell) 30+ times and then kill the horde. You'll gain no XP but get exactly one Level up per Monster !!!

2.) ColdDamage1+Vampirism-Vigilant-Kizoar 'Cheat/Trick/Exploit/Bug'
Use a ColdDamage1 spell in combination with vampirism and attack/kill a Vigilant Kizoar (name of the monster). Again you gain no XP but exactly one Level up.

I've also found another Cheat/Trick/Exploit/Bug to really Level fast for Meleefighters, but I still have to do some testings. I'll keep you informed!