Macbook Airport keeps disconnecting

Do you have access to the wireless router? You can download iStumbler and use it to look at all the wireless networks in your area and you can see what channel they are on. If your wireless router is on the same channel as another wireless router you will have to log into the router and change the channel so there isnt interference.

What standard and frequency do you use? (EX: 802.11a/b/g/n, 2.4GHz/5Ghz Do you have a microwave and/or cordless phones? Do you have any other comparable source? How far away is the router from the computer?

the suggested sources of interference are definitely worth looking into, but it should be noted that if you do a search here or on apple discussion boards there are a lot of people complaining of similar issues. if you are in windows, it is not a problem, if you revert to tiger, it is not a problem. it is a niggling software problem that apple seems unable to tie down and doesn't seem to affect everyone.

in case you were wondering i own neither a cordless phone nor a microwave and there are no other wireless signals in my area and the router is never more than a room away.

some are praying 10.5.7 will fix your issue, but i'm not hopeful,.i think snow leopard *may* do something to address it.