One easy way to increase skills in Fallout 3 is with the Bobblehead figurines found throughout the game. They are quite well hidden though, I myself think I'm about halfway through the game and have only found a few so far. Therefore I thought it would be a good idea to make a list of where to find them. Some of the information here is taken from other sources, I have not found all of them myself :) The ones I did find myself have the best detailed description though ....

Obviously I'll need help from all of you to make the list even more complete.

SKILL BobbleHead locations :

BobbleHead MEDICINE - Increase medical skill +10 - Found in Vault 101, right in the beginning of the game on your Dad's desk. If you didn't find this one, it's time to head back to the Vault !!
Click here for picture of its location  

BobbleHead SPEECH - Increase speech skill +10 -  Found in Paradise Falls, Eulogy's Pad. Groundfloor, on the desk in the SW corner, near the 'main computer terminal'.

BobbleHead SCIENCE - Increase science skill +10 - Found in Vault 106, Living quarters, clearly sitting on a desk.

BobbleHead BARTER - Increase barter skill +10 - Found in Evergreen Mills - Market Bazaar

BobbleHead BIG GUNS - Increase big guns skill +10 - Found in Fort Constantine - CO Quarters

BobbleHead ENERGY WEAPONS - Increase energy weapons skill +10 - Found in Ravenhold

BobbleHead EXPLOSIVES - Increase explosives skill +10 - Found in WKML Broadcast Station - Sealed Cistern

BobbleHead LOCKPICK - Increase lockpick skill +10 - Found in Bethesda - Bethesda Offices East

BobbleHead MELEE WEAPONS - Increase melee skill +10 - Found in Dunwich Building - Virulent Underchambers

BobbleHead REPAIR - Increase repair skill +10 - Found in Aerefu - Evan King's House

BobbleHead SMALL GUNS - Increase small guns skill +10 - Found in National Guard Depot - National Guard Armory

BobbleHead SNEAK - Increase sneak skill +10 - Found in Yao Guai Tunnels - Yao Guai Den

BobbleHead UNARMED – Increase unarmed skill +10 - Found in Rockopolis – Head directly west from Casey Smith's Garage, look for tattered banners strung up. Use your local map or you may miss it.

STATS BobbleHead locations

BobbleHead INTELLIGENCE - Found in Rivet City, science lab, on the most right desk of the 3 desks you see there.

BobbleHead PERCEPTION - Found in the Republic of Dave - Museum of Dave

BobbleHead ENDURANCE - Found in Deathclaw Sanctuary - Deathclaw Sanctuary Entrance

BobbleHead CHARISMA - Found in Vault 108 - Cloning Lab

BobbleHead AGILITY - Found in Greener Pastures Disposal - Office

BobbleHead LUCK - Found in Arlington Cemetery North - Arlington House

BobbleHead STRENGTH - Found in Megaton - Lucas Simms House

if you know better detailed information on where to find any of the Bobble Heads, please post a comment and I will update it in the list.