Finding keywords, related words, words that are getting high bids and highly searched keywords is an important webmaster job for writing articles and uncovering niche areas.

Here are some tools that can help with the task:

Google’s keyword suggest tool

Visual Thesaurus

Lexfn

Googspy

Buzz Yahoo

Spyfoo - find out how much other companies are bidding on keywords

Good keywords - Free Windows application for finding keywords and misspellings