I have as many as 50,000+ keywords in accounts but I rarely use bulk upload tools other than spreadsheets downloaded from Yahoo, then populated, then uploaded again.
I often download all Yahoo ads and send them to Looksmart. I much prefer working online to spreadsheets; however, that was faster and easier at both Google and Yahoo in the past. Both are slower and more cumbersome now.
I suggested to Mary O'Brien (who gives the awesome Yahoo! Search Marketing seminars and is about to introduce new PPC seminars covering multiple PPC engines) that perhaps her company could produce some instructional material on working with bulk tools.
Few people truly realize how complex PPC advertising is or how to effectively use and control it. I do my best to share critical, timely information and the basics. When I find a source for what you're seeking I will use it myself and point visitors here to what I've found.
If anyone reads this and has suggestions please do post or, if you prefer, you can send them via PM to me and I will post them for you.
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