All in one SEO pack is a good start.

I use Jeff Johnson's free traffic getting plugin too - which uses all in one SEO pack as one of the components.

Google will show you where they live.

Yep! All In One SEO

I will add "Yet Another Related post plugin"

All in One SEO
SEO Friendly Images
Redirection

These plugins help my review blogs a lot.

yes as some have already said:
All in one SEO pack.
Google XML sitemap
But I also like
Future Calendar
It has a function that shows what dates have a future post scheduled in a calendar format, and makes it easy to change the current timestamp.
Insights
Insights allows you to quickly search and insert information (links, images, videos, maps, news..) into your blog posts.

I second these plug-ins. And add...

Auto Tag
Ad Manager
Google Analytics
Taxt Widgets
Askimet

Hope this helps

[DELETED]

I recommend Platinum SEO over All-in-One SEO because AIO has become annoying between constant bug fixes and the activation/donation nag screen.

I don't recommend using an XML site map plugin if you're on shared hosting. This plugin is a processor pig and can get your account shutdown, especially when you use it with autoblog scripts. As long as you have decent navigation in your theme you won't gain much from using this plugin anyway.

I do recommend the Dagon Sitemap Generator for mid-sized sites to improve visitor navigation. It isn't needed for smaller niche sites and I don't recommend it for high output autoblogs.

I recommend Yet Another Related Posts Plugin. This plugin can be very helpful in getting a double listing in Google.

I use All in One SEO pack and Google XML sitemap plugin currently.

The best SEO plugin is not requiring a plugin at all.

Start out with a theme that enforces good SEO practices and you don't need the bloat and processor drain of a bunch of plugins, all with potentially overlapping functionality.

At a minimum, your theme should...

1) Allow you to create a keyword rich page title. This is THE most essential element to your site's SEO potential

2) Allow you to create a post excerpt that can also be used as your page's meta description. This is what Google will use in the SERPS under your title and is your value proposition for your page.

3) Automatically structures your post title in an H1 heading element.

4) Creates a structurally sound page using semantically accurate xhtml and leveraging concise and validated css for presentation. This is the key to your site's speed and accessibility, which is a definite factor in your SERP according to Google.

Once you've got that down, if you need any runtime plugins, I'd be very surprised. At best, you might use Google XML sitemaps to gain a slight measure of control of how your pages are being indexed.

Hope that helps.

~ s

Honestly I prefer headspace2 full list of plugins I use can be found on my blog via the sig under blog tips