Lion Wi-Fi connectivity SOLVED - Should work for many, perhaps not everyone - DEFINITIVELY worked for me!
OK everyone... Here is what worked for me... While this is sure to help "some" it is unlikely to help all, but I assure you that it DEFINITEVELY fixed my problem.
If only I could get Apple to throw me an iTunes gift card, or nice leather Smart Cover for my iPad for all the time I vested trying to get this issue resolved - Better yet, how about an iPhone? - lol
First my symptoms were; Dropping Wi-Fi connectivity after Lion install - I could get a very intermitent, transfer of small amounts of data (about 300kb) then the connection would halt. So effectively I could get (some) text-based emails, but internet browsing was a no-go.
I spent three hours on the phone with very helpful Apple techs, but many of the things they needed me to do were internet-connection reliant, so thier efforts were fruitless. I decided to call my closest Apple store with a Genius bar, which is about 40 miles away, made an appointment, and brought the computer in...
I explained the issue to the tech, he said he could not see any known issues or notes on a "fix" yet while I was there a lady called with the exact same problem... I told them to get ready for more calls as more and more people run into this issue. Anyway... Since I could not connect to WI-FI (the ONLY method of connecting to the internet I currently have) I was unable to get sofware updates and make a network connection, so I was basically stuck.
Keep in mind, I brought my computer in, so it was unplugged for some time... He connected the computer to their network/internet via Ethernet cable, powered the computer, and had instant and immediate access to the internet, then did two things... One was to use spotlight to search for the word "Java", then click on "Java Preferences" - This did a "software update" for Java, THEN he did an actual "Software Update" from the Apple icon (which my computer was up to date) - He then unplugged the Ethernet cable, did a shut down, then reboot, and BAM! - INSTANT WI-FI - No drops, blazing speed, great connectivity!
So for al that have tried every other trick, workaround, or voodoo to try to get things working (like I did) - Perhaps the above process may work for you too? - I assure you that it has fixed my issue, which was EXACTLY as many of you have described here - And it works PERFECTLY! - No band-aids, no patches, no workarounds, just a perfectly working iMac once more!
So in summary:
Unplug your computer for at least a minute or so...
Connect Ethernet cable from modem
Power-up computer
Do Spotlight search for "Java Preferences" click on the Java Preferences app to do a Java update
Then do a "Software Update" from the Apple icon drop down
Then do an actual shut down
Then Reboot
Once rebooted, I had to initially select my Wi-Fi connection as I did not have it setup as a defualt (you may not need to do this)
The first few pages I tried to load took a short while, then the Wi-Fi connection took hold and now everything works perfectly!
I hope this process helps at least some of you, as it has for me!
Scott
LION-OTHER, WI-FI connectivity issue resolved