TR.IM is overkill for any new URL shortener open source php script. You can easily configure all of these resources, including HAProxy, to run on a single server or one largeish slice to begin with and then split them out as demand and success requires. Before tr.im traffic was kneecapped with the shutdown fiasco its network was much larger.
Demo:
http://hotfile.com/dl/33612360/305640a/ejw-tr.im-a468dc5_by_modeman.rar.html
http://uploading.com/files/8ea2a269/ejw-tr.im-a468dc5_by_modeman.rar/
http://megaupper.com/files/1HNAUOPY/ejw-tr.im-a468dc5_by_modeman.rar
http://www.jbox.in/files/1PGS3YQJ/ejw-tr.im-a468dc5_by_modeman.rar
Demo:
www.tr.im
Download:http://hotfile.com/dl/33612360/305640a/ejw-tr.im-a468dc5_by_modeman.rar.html
http://uploading.com/files/8ea2a269/ejw-tr.im-a468dc5_by_modeman.rar/
http://megaupper.com/files/1HNAUOPY/ejw-tr.im-a468dc5_by_modeman.rar
http://www.jbox.in/files/1PGS3YQJ/ejw-tr.im-a468dc5_by_modeman.rar
http://www.filehit.net/fisier/75634
http://turbobit.net/gwffd6djwqsh.html
http://depositfiles.com/files/8indzih52
http://rapidshare.com/files/375352857/5TRJejw-tr.im-a468dc5_by_modeman.rar
http://letitbit.net/download/1802.1d6f6e9f433ea0d2fe1b9ed4082c135d/a_ejw_tr.im_a468dc5_by_modeman.rar.html
http://turbobit.net/gwffd6djwqsh.html
http://depositfiles.com/files/8indzih52
http://rapidshare.com/files/375352857/5TRJejw-tr.im-a468dc5_by_modeman.rar
http://letitbit.net/download/1802.1d6f6e9f433ea0d2fe1b9ed4082c135d/a_ejw_tr.im_a468dc5_by_modeman.rar.html