Well, RAM does eat up a fair amount of power - has to be on continuously, after all, even when the screen is off - so it may be battery-life-related; not sure why they were so stingy with RAM on the iPad with its gonzo batteries, but on the iPhone at least it might make a significant difference. I still think the things developers could do with 512 MB of RAM would be worth the tradeoff, though, so hopefully we'll see that in the second-gen iPad next year and the iPhone that follows it that summer, and in the meantime we can try to get a slightly less exciting mouseover Live Mode working in a desktop version of Pleco 