Having 2 systems...need help

I have a 32 inch sony bravia tv...only has 1 HDMI port...i am using that port for the ps3...i will b getting an xbox 360 soon..and was wondering how i can have them both connected...because i will get an HDMI cable for the xbox....i was also wondering about internet...i am using a wired connection for my ps3 which is connected to my cable modem that only has 1 ethernet port...how can i connect both systems??...any information would b helpful...

P.S...the PS3 is still the best..LOL

there are hdmi switch boxes. I saw one at an electronics store last week. some a/v tuners have that capability too.giton