New to wifi. will i get full use of my broadband bandwidth using wifi?

I have 2 meg broadband via a bt adsl line. currently using usb wired modem and acheiving 2 meg. looking to go wifi so i can use my laptop in any room and also connect to the family main desktop. i am looking at a wireless router which says it is 54 mbps maximum (whatever that means). if i change from wired to wifi, will i get the same upload/download speed from my wifi or will it slow my operation down? i use my wired modem for streaming webcam, voip and podcasting and also for downloading streamed video & audio (internet tv & radio). will i be able to do this with wifi as i can with wired? is wifi capable of routing 2 meg or higher broadband without losses or slowdowns? house has 2 computers but only 1 will be used at any one time.
Answer
Yes less the overhead the wireless part can run 27x faster than your broadband on a 54mbps connection