I think showing ads would just slow things down for who ever clicks on your short links and might put them off of visiting the page there looking for
That's how the sites years ago used to do things. Things may have changed. Great, now I feel old. One other thing, it is possible some people will remember you as zipUrl, you might loose some less intelligent users.
yea the redirect ads will make it hard to get users unless u can offer members the option to get a % of revenue! witch i would like to add to my sites! did u write this script ? you could also use a slogan like "ZIP Referral Links" R sumthing to help with the u issue help people 2 know that its not url it just RL = referral Link PeAcE
ziprl.com has now had a makeover for faster loading times and has also added a search http://search.ziprl.com page to search rapidshare etc.