Ok a while back I recall someone getting a processing system going wherein you can take cash to a place like Walmart, and buy something that can then be transferred into MtGox or into bitcoins directly or something. Well I ignored it for a while, but now that I'm interested again and can't find this information.
For that matter, anyone else have an easy way to either transfer via ACH, or Credit Card, or cash to a reputable bitcoin exchange?
You are referring to ACH so presumably that means you are in the U.S. If so the suggestions so far are good, Coinbase, up to $100 per drawn from your bank account, until you have 30 days then it can get bumped to a higher limit. You don't get the coins right away but the exchange rate is locked in (with the presumption there that they don't determine it to be "high risk" and cancel it between after you started waiting and when their deadline for delivery arrives).
BitFloor, cash deposit at Bank of America (no account needed there) or online if you have an CapitalOne 360/ING account.
A method using Dwolla is likely the cheapest, though there too you are stuck during a starting 30-day probationary period before you can use the funds for deposit to a Bitcoin exchange. Once you are past that though it work great, just $0.25 per-transaction. The exchanges that take Dwolla currently are Camp BX and MtGox, and more are coming.
There might be some other methods that work for you as well. Ziggap is down for maintenance at the moment but they have a cash deposit method through Western Union.
Here's the fairly comprehensive list:
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http://en.bitcoin.it/wiki/Buying_bitcoins