None. It's impossible to send bitcoins to an invalid address. Those addresses are valid, though they may not be owned by anyone. Look at pszBase58 more carefully: 'o', 'i', and 'L' are allowed. The first few posts in that forum thread are wrong.

The network doesn't know anything about Bitcoin addresses. At the network level, you never send bitcoins to an address. Bitcoins are sent to "scripts". Your client converts addresses into appropriate scripts. If an address is invalid, it can't be converted into a script. So the idea of sending BTC to an invalid address is nonsensical.

None. It's impossible to send bitcoins to an invalid address. Those addresses are valid, though they might not be owned by anyone. Look at pszBase58 more carefully: 'o', 'i', and 'L' are allowed. The first few posts in that forum thread are wrong.

The network doesn't know anything about Bitcoin addresses. At the network level, you never send bitcoins to an address. Bitcoins are sent to "scripts". Your client converts addresses into appropriate scripts. If an address is invalid, it can't be converted into a script. So the idea of sending BTC to an invalid address is nonsensical.