Trans International announced the immediate availability of 512MB and 1GB memory upgrades for the new MacBook on Thursday. The 667MHz DDR2 SDRAM (PC2-5300) SO-DIMM chips meet Appleis strict electrical and mechanical design guide lines, and since the MacBook includes two user-accessible memory slots, you can increase your RAM up to 2GB. The chips are available at the Trans International Web site, and are priced at US$59 for 512MB, and $109 for 1GB.