Simple tables plugin (use [table]...[/table] shortcode around CSV data in rows.

simple-table.php

<?php
/*
Plugin Name: Simple Table
Plugin URI: http://ottopress.com/wordpress-plugins/simple-table/
Description: Add a [table] shortcode for making tables
Version: 0.1
Author: Otto
Author URI: http://ottopress.com
License: GPLv2
License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
*/

function simple_table_pre_process_shortcode($content) {
	global $shortcode_tags;
	$orig_shortcode_tags = $shortcode_tags;
	$shortcode_tags = array();
	add_shortcode('table','simple_table_shortcode');
	$content = do_shortcode($content);
	$shortcode_tags = $orig_shortcode_tags;
	return $content;
}
add_filter('the_content', 'simple_table_pre_process_shortcode', 7);

function simple_table_shortcode( $atts, $content = "" ) {
	$content = trim($content);	
	$rows = str_getcsv($content, "\n");
	foreach($rows as $num => $row) {
		$data[$num] = str_getcsv($row);
	}
	if ( !empty( $data ) ) {
		$content = '<table>';
		foreach ( $data as $row ) {
			$content .= '<tr>';
			foreach ( $row as $item ) {
				$content .= '<td>'.$item.'</td>';
			}
			$content .= '</tr>';
		}
		$content .= '</table>';
	}

	return $content;
}

add_filter( 'no_texturize_shortcodes', 'shortcodes_to_exempt_from_wptexturize' );
function shortcodes_to_exempt_from_wptexturize( $shortcodes ) {
    $shortcodes[] = 'table';
    return $shortcodes;
}