Could something have become corrupted since the ibiblio trouble, say only partially updated or something?
It's unlikely unless you freshly loaded them during the last two weeks, because the wireless extensions are 8+ months old and the openssl extension hasn't changed since late November.
To check, I just upgraded my Eee PC 4G (ath5k) from TC 3.1 to TC 3.4.1 and ran extension updates -- both the wired and wireless connections are working flawlessly.
For comparison purposes, here are my ping rates using WPA on a router connected to broadband:
--- google.com ping statistics ---
69 packets transmitted, 69 packets received, 0% packet loss
round-trip min/avg/max = 49.109/55.394/88.370 ms
--- tinycorelinux.com ping statistics ---
68 packets transmitted, 68 packets received, 0% packet loss
round-trip min/avg/max = 104.782/110.800/134.424 ms
Perhaps start by pinging your router over a wired connection. If the round-trip time is < 1 ms you can rule out a faulty cable or LAN port. If it's much more than 1 ms, run another ping test with a different computer on the same cable. If that's < 1 ms, then the problem is with your Eee PC. If it's over 1 ms then the problem is either with the cable or router. To figure out which one, try a different cable, or the same cable on a different port.
As for troubleshooting the wireless, first try downloading the extensions on another computer and transfer them over via USB stick. If the trouble persists, it could be due to signal interference from a cordless phone (yours or a neighbor's) or another wireless router using the same frequency.
In any case, it would help if you post the error messages generated when you start your wireless connection.