If you are planning on to unlearn your profession and level another one to 375.

DON'T DO IT!

When WotLK will launch, most of the professions will have a lot of new recipes, and those recipes starts orange at 350. If you leveled any crafting profession to 375, you already know that leveling professions after 350 is realy expensive. After WotLK launch, you can level your professions a lot cheaper.

So, if you want unlearn your profession and level another one, I recommend you to level it only to 350, then wait until the expansion launch.

Inscription leveling guide update

Finaly I could copy my bank character to the BETA with 1200 Herbs, so I can update the guide in a couple of days.

Since now you can level inscription up to 450, I have updated the Inscription leveling guide. A lot of the recipes, materials, skill up ranges are still bugged or missing. However now you can at least know the list of materials that you should stock up before the expansion. Because I belive it won't change that much.

In the current beta, Burnt Pigment has not yet been found by milling herbs. Herbs in the 225 skill (which includes Dreamfoil) and 275 skill (Outland-only herbs) groups currently do not mill into pigments. You will still sometimes gain a bonus item. This bug probably prevents leveling to skill 400. Pigments in these 2 groups are shown based on information from the previous beta version.

Inscription leveling guide - updated for Beta Build 8095

WotLK Beta Build - 8905

Profession Changes

Alchemy

• 2 new recipes

Cooking

• 7 new recipes

Inscription

• Inscription now has its Master and Grand Master - so it's up to 450.

Jewelcrafting

• 12 new recipes

I finaly got a WoW WotLK beta key, so you don't have to wait too long until I will finish my Inscription leveling guide.

This is not my guide yet, I found this guide on a blog, and I thought I will share this one with you, until I finish mine. My guide will be more detailed with links and stuff.

UPDATE: I finished the beta version of the guide now.

A few info about the new Profession in WoW: Inscription

• The first batch of lowlevel glyphs where implemented in this patch so we can go further into the mechanics of the new primary profession. How does it work?
• Aside from glyphs, inscriptionists can scribe scrolls, create parchments for Enchanters to put their Enchantments onto, and create tarot cards that can be turned in for rewards at questgivers.
• The primary gathering profession of Inscription is Herbalism.
• The crafted glyphs stack up to 5, most of them are BoE so they can be put in the Auction House
• The materials for glyphs can be made using the "Milling" Inscription skill which turns 5 herbs into pigments and then those into Inks. The following Inscription skill is required to mill certain herbs:
• Inscription 1: Bloodthistle, Earthroot, Mageroyal, Peacebloom, Silverleaf
• Inscription 25: Briarthorn, Bruiseweed, Strangelkelp, Swiftthistle
• Inscription 75: Grave Moss, Kingsblood, Liferoot, Wild Steelbloom
• Inscription 125: Fadeleaf, Goldthorn, Khadgar’s Whisker, Wintersbite
• Inscription 175: Arthas’ Tears, Blindweed, Firebloom, Ghost Mushroom, Gromsblood, Purple Lotus, Sungrass
• Inscription 225: Dreamfoil, Golden Sansam, Icecap, Mountain Silversage, Plaguebloom.
• Inscription 275: All Outland herbs
• Inscription 325: All Northrend Herbs
• Herbs are categorized into level ranges, all herbs of the same level range when milled create the same pomace, meaning the cheapest herb of a given set is the best choice for making a glyph.
• Glyphs can be used to augment melee and spell abilities so the spellbook has a new tab to keep a track of them.
• Since the glyphs are very cheap, allowing to swap them easily, there is a 1 Hour cooldown on every glyph (not shared).
• Applying the glyph to your spellbook consumes the glyph, but it can be removed or immediately replaced with another.
• Slots are unlocked automatically as the character levels up. Level 15 unlocks the first 2, then the third at level 30, fourth at level 45 and the final two slots are available at level 60. Of these 6 slots, 3 are major slots, 3 are minor slots.
• Major glyphs modify combat spells to make them more efficient for a certain task
• Minor glyphs modify reagent costs, allow cosmetic changes, etc... Basically nothing that can change the outcome of a fight.

source: worldofraids.com