I was able to develop a module on my own to accomplish this goal.

Basically, it creates a new attribute for each product and will send an email each day with any products who are active, sellable, and below their "low stock" threshold (excluding any whose threshold is below 0).

You can see the code in my GitHub repository: https://github.com/travs-w/low_stock_notify

product.py

from openerp import models, fields, api
from datetime import date
import StringIO
import base64
class Product(models.Model):
    _inherit = 'product.template'
    qty_low_stock_notify = fields.Integer(string='Notify for Qty Below', default=80,
                                          help='When stock on hand falls below this number, it will be included in the low stock report. Set to -1 to exclude from the report.')
    def send_low_stock_via_email(self, cr, uid, context=None):
        header_label_list=["SKU", "Name", "Qty On Hand","Qty Incoming","Low Stock Qty"]
        ## Get email template
        template_obj = self.pool.get('email.template')
        template_ids = template_obj.search(cr, uid, [('name', '=', 'Low Stock Automated Report')])
        template     = template_obj.browse(cr, uid, template_ids)
        if template:
            default_body = template.body_html
            custom_body  = """
                <table>
                    <th>%s</th>
                    <th>%s</th>
                    <th style="text-align:center;">%s</th>
                    <th style="text-align:center;">%s</th>
                    <th style="text-align:center;">%s</th>
            """ %(header_label_list[0], header_label_list[1], header_label_list[2], header_label_list[3], header_label_list[4])
            ## Check for low stock products
            product_obj  = self.pool.get('product.product')
            product_ids  = product_obj.search(cr, uid, [('active', '=', True), ('sale_ok', '=', True), ('default_code', '!=', False)])
            for product in product_obj.browse(cr, uid, product_ids):
                product_sku = product.default_code
                if not product_sku or product_sku == '':
                    continue
                qty_available = product.qty_available
                qty_incoming  = product.incoming_qty
                qty_low_stock_notify = product.qty_low_stock_notify
                if qty_available <= qty_low_stock_notify and qty_low_stock_notify >= 0: ## set low_stock_notify = -1 to never be notified
                    custom_body += """
                        <tr style="font-size:14px;">
                            <td>%s</td>
                            <td>%s</td>
                            <td style="text-align:center;">%s</td>
                            <td style="text-align:center;">%s</td>
                            <td style="text-align:center;">%s</td>
                        </tr>
                    """ %(product_sku, product.name, str(qty_available), str(qty_incoming), str(qty_low_stock_notify))
            custom_body  += "</table>"
            template.body_html = default_body + custom_body
            send_email         = template_obj.send_mail(cr, uid, template.id, uid, force_send=True, context=context)
            template.body_html = default_body
            return True

product_template.xml

<?xml version="1.0"?>
<openerp>
    <data>
        <record id="view_low_stock_notify_product_form" model="ir.ui.view">
            <field name="name">Add Low stock notify field product form</field>
            <field name="model">product.template</field>
            <field name="inherit_id" ref="product.product_template_only_form_view" />
            <field name="arch" type="xml">
                <xpath expr="//field[@name='state']" position="before" >
                    <field name="qty_low_stock_notify"/>
                </xpath>
            </field>
        </record>
    </data>
</openerp>

ir_cron.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">
        <record id="ir_cron_send_low_stock_via_email" model="ir.cron">
            <field name="name">Check Low Stock and Notify</field>
            <field eval="True" name="active"/>
            <field name="user_id" ref="base.user_root"/>
            <field name="interval_number">1</field>
            <field name="interval_type">days</field>
            <field name="numbercall">-1</field>
            <field name="doall" eval="False"/>
            <field name="model" eval="'product.template'"/>
            <field name="function" eval="'send_low_stock_via_email'"/>
            <field name="args" eval="'()'"/>
        </record>
    </data>
</openerp>