I was finding that when I was at work, my MBA running Lion would connect automatically to our wireless network. At home, however, I had to manually reconnect every time I closed the lid or the computer went into sleep mode.
I just upgraded to 10.7.1 and now my computer seems to reconnect after sleeping or closing the lid just fine.
I just upgraded to 10.7.1 and now my computer seems to reconnect after sleeping or closing the lid just fine.