Connected to home wireless but not loading from web

I've seen all the answers here, especially some excellent and thorough information from user "Linc" but nothing is working for me.
We have Comcast internet and the wireless network 'all of sudden' last week was very slow on my Mac mini. My wife has her Dell laptop which has experienced no difference in service over the same time. So for around 6 months, all has been well.
My Mac mini is about two years old and I'm on OSX 10.6.8. I've not made any system os changes in the last 6 months nor have I added any software besides Sophos for virus scanning. However, as I mentioned, all has been well up until last week.
Now, after restarting, google will come up and maybe 1 or two searches will work but then it just spins and spins. Nothing loads in either Safari, Firefox or Chrome. I tried using Firebug to see if I could get some message about the network but nope. Full strength on the signal and connecting to the actual network fine.
First step I took was to reset the router; no difference. I also tried unplugging the router but again no difference on my Mac. Laptop still connected via wireless as usual.
I then got rid of the /Library/Preferences/SystemConfiguration files restarted to generate new files; no difference.
My Asus Transformer tablet can connect to the same network just fine so it's definitely something on the Mac mini.
The last thing I tried was shutting down, unplugging the machine for 15 secs; pluggin it back in, waiting for 5 sec and turning back on. No change.
Besides any suggestions, I'd also like thoughts as to what could cause this from a process pov. No OS changes have been made like upgrads or system components upgraded which I could see could cause something weird but what else is actually 'in the works' that could cause such a problem? It doesn't feel like "the xx file has become corrupted".... because, well... how? How do "xx files" become corrupted absent of crashes, power-outs, viruses or system upgrades?
Thanks for insights!
Kelly

I uderstand that the other equipment works but they will use different software to access DNS etc, appreciate it should not make a difference but, sometimes it does.
This is an article for flushing dns caches, it is useful to do if you have dns problems.
http://support.apple.com/kb/ht5343
I think I am correct that in SL the DNS resolver is different for web browsing or the terminal commands, one uses the newer mDNSresponder the other resolver. If I am wrong someone will put me right.
SL had a few problems with this system when first introduced, the main one seemed to the prefetch which was too high for some systems, that is why I suggested it as a possibility.
No other ideas for now, see if anything comes to mind tomorrow.

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Edited by: francis_ on May 13, 2008 10:03 AM

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* To change this template, choose Tools | Templates
* and open the template in the editor.
package com.flt;
* @author Francis Lukose
public class Test {
    public static String hello()    {
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}Many Thanks,
Francis
Edited by: francis_ on May 13, 2008 6:45 PM

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~~~~~~~~~~~~~~~
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