When we took a look at the ASUS Eee PC we noted the little 'warrant void if removed' sticker covering the memory access port, but we didn't really care. After all, ours was just a review unit and despite our repeated and futile attempts to convince ASUS officials that our dog ate our demo unit, we ultimately knew that we were going to have to return it. People forking over up to $500 for the 8 GB models may have other concerns, and ASUS is addressing them directly:
“ASUS Computer International (“ASUS”) recently received feedback from one of its valued customers with questions concerning the purpose of a seal stating, “Warranty Void If Removed” over the access door to the single SODIMM slot on some models of the ASUS Eee PC. ASUS wishes to assure its customers that merely breaking or removing this kind of seal will not void the ASUS Limited Warranty. Although ASUS recommends that customers use ASUS-approved service facilities and components, ASUS is committed to honoring the terms of its Limited Warranty and making sure that its customers are free to make appropriate hardware and software modifications and upgrades, regardless of whether the service is performed by an approved facility, a non-approved service provider, or by the customers themselves. ASUS will replace the warranty label with a label to warn users that ASUS will not be responsible for the damage caused by improper hardware change.
ASUS is taking steps to make sure that the seals in question are no longer used in its products that are intended to be sold in any country where these stickers are not permitted.”
So, upgrade your memory if you feel up to the task, or take it to a tech shop if you wish. Either way ASUS stands behind their products, and that's one of the reasons that they are an industry mainstay.