This is a nice unit, but the CPU limits the wireless throughput. I have OpenWRT on an Asus WL-520GU, and my wireless transfer over a WPA2 link maxes out at about 6 Mbps instead of the 10 or 11 Mbps I get when connected over Ethernet cable to the box. The CPU/chipset does doesn't have enough to keep up with the encryption at the higher bitrates. I'm waiting for a good 802.11n OpenWRT supported router to be available and I'll jump right away, even though all my clients are still 802.11g only - the n routers usually have more CPU power and/or WPA2 better supported in the hardware.

Sure, Tomato is simple and pretty looking. Apart from the IPv6 issues mentioned by others, the biggest issue for me with Tomato is that it doesn't support VLANs on Broadcom hardware. OpenWRT and DD-WRT both support them, and OpenWRT is really open, so I use that. The live statistics graphs and such in Tomato have an equivalent package in OpenWRT.

Note that also, there exist 4GB SD cards as well as 4GB SDHC cards, however for devices that don't support SDHC, support for SD cards larger than 2GB is hit or miss. The SD standard actually supports up to 4GB, but as happens all too often, signed vs. unsigned values are ignored/interchanged and some devices don't support the 4GB standard SD cards.