[citation][nom]simple11[/nom]Damn my 3G!....but not really worried.[/citation]
Actually, if you're willing to do a bit of hacking, there's a way to enable both backgrounds and multitasking on the 3G.
While I don't doubt that things are more cramped on the 3G's 128GB of RAM compared to the 3GS' 256MB, it seems that Apple could just be holding the 3G back for marketing reasons.