Leveling Inscription is cheapest and easiest if your other primary profession is herbalism. But whether you choose to stockpile your herbs or buy them all on the auction house, power-leveling inscription is a breeze if you know which recipes to focus on to level the fastest.
Panda a simple mod designed (initially) to speed up mass-disenchanting, this functionality was expanded to include prospecting and milling.
Ackis Recipe List, scans your trade skills and provide information on how to obtain missing recipes, patterns, enchants, plans, and schematics.
Inscription Leveling Guide 525-600
Inscription Leveling Guide 1-525