We've set up an internet banking account. Out of town (or country) clients can deposit money to our account from their own bank. There are some fees at both ends but if the client is in a rush to get started and you don't want to start until you see some $$, this can work well.
Cash is always nice. The only problem is that if you do a significant cash business involving relatively large amounts, you invite scrutiny from the taxman. Even if you aren't evading taxes, they tend to look at cash deals as suspect.
hth