I have BC2 in livingroom and beoport-PC in office. Also I have connected Airport Express to Aux socket of BC2. I have a macbook, too.
You can use airport express to connect beolabs, but you can't control it. I use airport express when PC is turn off, so I can hear music from iTunes (macbook) in livingroom and bedroom throught BV1, pressing A.aux. Also it allows hear different music in different place: n.music (beoport-pc) in office and iTunes in bedroom.
I tried beoport-mac and it's a good option. With the update bm-link 1.5 you can control Frontrow with Beo4. But with beoport-pc you have more possibilities: hear,see and control cd, dvd, v.tape, radio, dtv from master room, and send n.music and n.radio.
With mac-beoport you can't see DTV, V.tape... also send n.music and n.radio. Frontrow is only available throught of IR-eye connected to beoport, so you can't control frontrow in others rooms.
So, at the moment, I prefer beoport with pc. When Frontrow can be controlled in others rooms (throught IR of BV) I will change my opinion.