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Can anyone suggest a good tracking program who's code will not add alot of weight to my webpages.
Otherwise, why not add a tracking field to the redirected URL -- so when someone goes to www.thatsite.com, instead of redirecting them to www.mysite.com, you send them to www.mysite.com?src=www.thatsite.com.
Hope that helps,
What I would consider (and I claim a vague interest here so can't be specific) use an affiliate tracking system as it would then be possible using the right system to carry your unique phone numbers all the way into the main website AS WELL as track each campaign... so the phone number on the advert (or at least a unique extension number) appears in place or after the general phone number.
Other options - well, yes there are many. Infact I would suggest MOST tracking would do what you want.