More experience:
Join a Battle.net or other multi-player game and join a party. You and your partner will share experience. The more people in the party, the more experience everyone gets.

Secret Cow level:
Defeat Baal under the same difficulty setting that you are making the cow level in. Take Wirt's Leg (found in Tristram) and a Tome Of Town Portals and put them in the Horadric Cube. You must transmute them in Act 1.

Horadric Cube items:
Combine the following items in the Horadric Cube to get the corresponding new item.

3 Perfect Gems + 1 Charm	1 new Charm
3 Perfect Gems + 1 Jewel	1 new Jewel
3 Gems of the same type and grade (except perfect)	1 Gem of the next higher grade
6 Perfect Skulls + 1 Rare Ring	1 Rare Ring
6 Perfect Skulls + 1 Rare Amulet	1 Rare Amulet
3 Perfect Gems + 1 Ring	1 Magical Ring
3 Perfect Gems + 1 Amulet	1 Magical Amulet
3 Rings	1 Amulet; a higher level character will get a better quality amulet
3 Amulets	1 Ring; a higher level character will get a better quality ring
1 Perfect Skull + 1 Rare Item + Stone of Jordan	1 High Quality Rare Item of the same type
3 Perfect Skulls + 1 Rare Item + Stone of Jordan	Add 1 Socket to the Rare Item if item is socketable
6 Perfect Skulls + 1 Rare Item	1 Rare Item of the same type
4 Health Potions (any quality) + 1 Ruby (any quality) + 1 Magic/Set/Rare sword	1 Long Sword of the Leech; 3-19 Damage, 4-7% Life Steal
1 Diamond (any quality) + 1 Staff + 1 Kris + 1 Belt items used can be of any type or quality	1 Savage Bardiche; 166-180% Damage
1 Small Magical Shield + 1 Spiked Club (any quality) + 2 Skulls (any quality)	1 Small Shield of Spikes
3 Chipped Gems + 1 Sword	1 Socketed Long Sword with 3 sockets and random mods
2 Quivers of Bolts	1 Quiver of Arrows
2 Quivers of Arrows	1 Quiver of Bolts
1 Spear + 1 Quiver of Arrows	1 Stack of Javelins
1 Axe + 1 Dagger	1 Stack of Throwing Axes
3 Mana Potions + 3 Healing potions + 1 Gem (any type)	Full Rejuvenation Potion
3 Perfect Gems (any type) + 1 Magic Item	1 New Magic Item of the same type

Hint: Get any item:
Use the following trick to get almost any desiered item. Go to the person in your highest Act that gambles (for exampel, Gheed or Jamella). Go to gamble. A list of good items will appear. If you do not see anything desirable, exit, then go to gamble again. There will be a new list of items for sale. Repeat the process until you have found what you want.

Hint: Easy experience and items:
Create a Sorceress, then max out her Firewall. Trade some items for a good Tarnhelm, some ChaceGuards, and other +% to Magic Find items. You Sorceress should be at about level 45. Then, go to Channel Cows/Cowz and wait for someone to make a game. Join that game and Firewall all the cows. Your experience will increase and you will get unique items. Do not duel or do anything dangerous with this sorceress, as you will get killed.

Hint: More money for items:
The easiest way to increase the value of an item is to have it identified by a Identify Scroll or by Deckard Cain. The value will immediately increase.