With regards to memory....
Chrome opens up a complete momeory thread for every tab that is opened. The good side of this is that if one tab crashes out, it doesn't take out the whole browser - like in Firefox.
The downside of it is that it can eat vast amounts of memory when you open up multiple tabs. I had chrome running at nearly 300Mb last night with 8 tabs open.
So, you essentially trade off stability for the potential for Chrome to use lots of memory.
f you have plenty on your machine, then Chrom might be a good choice - certainly better than IE 7 or IE 8, and about equivilant with Firefox. the latest Alpha and beta nightly builds of Firefox outperform it, but Chrome is a little more stable. If your a bit tight on memory, then firefox or Opera are probably a better choice.
The other thing to note is that both Firefox and Internet explorer have had a good few years to be battered and attacked by security researchers, where as there is a lot of brand new code in Chrome which no one has had a chance to start attacking yet.
it is incredibly unlikely that there will no one will find holes in chrome, and it might need to go through a couple of releases until it becomes a tight and secure platform.
Again, on the flip side, google are generally quite good with security and decent-ish quality coding, so there probably won't be the vast holes in it that there were in, for example, IE 6
It's a good browser and fast. if you have some spare memory, or don't use huge numbers of tabs when you browse, then it is a good platform. Whether you should trust it to do your on-line banking with just yet is a slightly different issue. caveat Empor
Steve