Single Publication With Multiple Subscribers What should I be aware of before adding multiple subscribers to single publication?

Obvious ones I can think of are server capacity and network bandwidth. 

Should I be aware of anything else?
Make sure distribution database is set up correctly with data and log file sizes based on the volume of data you are planning to replicate. I am not sure which version of SQL you are using, but i had issues when i was replicating from 1 publisher to 2 subscribers in SQL 2008 during re initialization. My issue was related to virtual memory being maxed out at one subscriber. It may not be applicable in your case.