One thing I've not seen mentioned on this thread is using penguins to train slower skills slightly. It generally takes 10-15 minutes to find all 10 penguins + the polar bear. I'll use 20 minutes as a base to account for world hopping. exchanging points and the occasional nasty penguin should you choose to find it such as ones found in the elven quarry. At level 99, penguins give 39,600 exp per week. At 20 minutes a session, this equates to 118,800 exp per hour. Now although these experience gains are quite low, over a period of 5 years this is over 10M experience in your chosen skill. The experience rate generally used for agility appears to be 101k PH (taken from Xen's calculator). At 20 minutes a session in 5 years you gained approximately 10,296,000 experience in agility in 86 hours and 40 minutes. Had you trained agility the standard ways, this much experience would have taken almost 102 hours. So, penguins can save over 3 hours a year when it comes to training agility even when generous times given to find all the penguins are used. I choose agility because I get the impression people aiming to max all skills will train agility at the agility courses at some point so the experience rate is directly relevant. Also provides an alternate way of training for people who don't particularly enjoy skills which train at under 118,800 exp PH. May seem fairly negligible but hey, everyone here seems to enjoy ultimate efficiency so thought I'd throw it out there.