I use a Wireless Easynet PCMCIA card I bought from AmigaKit. I have MiamiDX installed. (It took me one minute to get online)
I also bought Amiga Explorer from Cloanto and can transfer files from my PC "wirelessly"

Pretty funky.
Other than that I think there are several other solutions you can find at Amiga shops such as Amigakit, Vesalia, etc. (PCMCIA card readers, IDE card readers, clockport USB devices, etc.