Can't connect to internet on WiFi network

I have a cable modem hooked to a wired router (Linksys) hooked to a wired/wireless router (DLink). My Windows laptops and PSP can connect to my WiFi network just fine, and up until about 2 days ago, my iMac could too. But now, it recognizes the network and I can connect to my other computers, but I cannot connect to the internet. When I used the diagnostics from OSX, sometimes they would say the internet was working (though it definitely wasn't) and sometimes it would say it wasn't. My signal strength is fine and I haven't changed any network settings on the computer or to the network itself. I think I just installed some updates from Apple, but I'm not sure. Please advise.

I had the same problem on my G4 tower a few weeks ago. Drove me nuts! I finally got past it by accident. I had created a Home location in the Network preference panel. That one wasn't working. Could see the local network, but couldn't hit the internet to save my life. By accident, I switched back to the Automatic location that comes as a default. That one worked! Haven't had a problem since.
I think the issue might be preference corruption of some kind. I'm not sure.
Anywho, try creating or using a different location on your Mac and see if a fresh set of setting will get you through to the internet.
Doc

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    MacFUSE.prefPane
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    ParallelsTransporter
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    SkypeABDialer.bundle
    SkypeABSMS.bundle
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    Smart Crash Reports
    Library/Installer Logs:
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    Rave.plugin
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    com.adobe.ARM.925793fb327152fd34795896fa1fb9ffa268b2a852256fe56609efa3.plist
    com.apple.FTMonitor.plist
    com.apple.SafariBookmarksSyncer.plist
    com.apple.apsd-ft.plist
    com.apple.imagent.plist
    com.apple.marcoagent.plist
    ws.agile.1PasswordAgent.plist
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    Library/Mail/Bundles (Disabled):
    Library/PreferencePanes:
    Contents
    Library/ScriptingAdditions:
    .DS_Store
    1Password Addition.osax
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