How can I add more than one logo to my beamer presentation?

Beamer provides \logo{} to set the logo(s). You could just add all three logos in there using three \includegraphics command (or PGF image commands). Where they are placed depends on your chosen scheme. If you want them a little larger on the title page you can insert the defined logo(s) manually \insertlogo e.g. inside a \scalebox.

The following code adds three scaled logos with one space as a separator into the right border. The default (blank) scheme puts them into the lower right corner.

\documentclass{beamer}

\author{Me}
\title{Presentation}
\logo{%
    \includegraphics[width=1cm,height=1cm,keepaspectratio]{logo1}~%
    \includegraphics[width=1cm,height=1cm,keepaspectratio]{logo2}~%
    \includegraphics[width=1cm,height=1cm,keepaspectratio]{logo3}%
}
\institute{Three Kings\\\scalebox{2}{\insertlogo}}
\begin{document}
\frame{\maketitle}
\frame{text}
\frame{}

\end{document}

you can have several logos on the page. The question is only where they should appear. Here an example for the second one in the sidebar.

\documentclass{beamer}
\usecolortheme{dove}
\useoutertheme{sidebar}
\pgfdeclareimage[height=2.25ex,width=2.5\baselineskip]{institut-logo}{zedat}
\pgfdeclareimage[height=1.3cm]{uni}{fu-berlin}
\logo{\pgfuseimage{uni}}
\setbeamertemplate{footline}{\raisebox{-2ex}{\pgfuseimage{institut-logo}}
  \usebeamerfont{date in head/foot}\insertshortdate{}\hfill
  \usebeamertemplate{navigation symbols}\hfill
  \insertframenumber{}/\inserttotalframenumber}
\setbeamertemplate{sidebar right}{}

\begin{document}
\begin{frame}{Das Logo}
\begin{block}{Ein Beispiel mit der Umgebung \texttt{block}}
Es ist offensichtlich, dass wir hier zwei Logos auf der Folie haben.
\end{block}
\end{frame}
\end{document}

from: http://tex.stackexchange.com/questions/18410/how-can-i-add-more-than-one-logo-to-my-beamer-presentation

Logo in Latex Beamer Presentation / Slideshow

• The logo is on the bottom right corner of every page: to do that use the \logo command. Here's a complete code example:

\documentclass[compress]{beamer}
\usepackage[latin1]{inputenc}
\usepackage{pgf,pgfarrows,pgfnodes,pgfautomata,pgfheaps,pgfshade}
\usepackage{amsmath,amssymb}
\usepackage[latin1]{inputenc}
\usepackage{colortbl}
\usepackage{graphicx}
\usepackage[english]{babel}
\usepackage{tabularx}
\usetheme{Singapore}%define the beamer theme
\setbeamertemplate{navigation symbols}{}%remove navigation symbols\setbeamertemplate{section in head/foot shaded}[default][20]\setbeamertemplate{subsection in head/foot shaded}[default][20]
\logo{\includegraphics[height=0.5cm]{youlogoname.eps}} %change here. I used an eps file logo, you can use jpg or other format
\title[My Title ]{My~Title}
\author[My~Name]{My~Name}
\institute[My Institute/company]{My Institute/company\\ \date[DLT 2007]{My Seminar name/place/date}
\subject{My title/subejct}
\begin{document}
Type document content here
\end{document}

• The logo is only on the front page: use \pgfdeclareimage and\pgfuseimage. Here's teh example:

\documentclass[compress]{beamer}
\usepackage[latin1]{inputenc}
\usepackage{pgf,pgfarrows,pgfnodes,pgfautomata,pgfheaps,pgfshade}
\usepackage{amsmath,amssymb}
\usepackage[latin1]{inputenc}
\usepackage{colortbl}
\usepackage{graphicx}
\usepackage[english]{babel}
\usepackage{tabularx}
\usetheme{Singapore}%define the beamer theme
\setbeamertemplate{navigation symbols}{}%remove navigation symbols
\setbeamertemplate{section in head/foot shaded}[default][20]
\setbeamertemplate{subsection in head/foot shaded}[default][20]
\title[My Title ]{My~Title} \author[My~Name]{My~Name}
\institute[My Institute/company]{My Institute/company\\ \pgfdeclareimage[height=0.5cm]{myalias}{pselogo} %declare logo image with an alias here \pgfuseimage{myalias}} %use the image right after
\date[DLT 2007]{My Seminar name/place/date} \subject{My title/subejct}
\begin{document}
Type document content here
\end{document}

from: http://stuffforlife.blogspot.ca/2008/10/logo-in-latex-beamer-presentation.html

怎样压缩PDF文件？

有时候我们制作完的PDF文件体积很大，但是又要发送邮件或者在网络上传送用，体积打了当然不方便，那么我就想到了能不能把文件压缩一下呢？（注意我们这里的压缩指不改变文件格式的压缩，而不是用压缩软件压缩成rar、zip、7z等文件）这里我就讲一下用专用软件压缩PDF文件。

Adobe acroabt pro 8 本人推荐使用等级 ★★★☆
运行Adobe acrobat pro 8，这次使用的是高级里面的PDF优化器，如下图 点击PDF优化器，弹出优化器界面，首先我们先来了解一下这个PDF文件的构成情况，所以我们先点右上角的“统计空间使用情况”按钮，弹出对话框，如下图
从这个统计数据百分比中我们很容易就看出，这个PDF文件中主要是图像占的空间大，所以我们压缩的主要对象就是图像。 点确定回到优化器页面如下图那么我们在界面的左边部分是优化的项目，右边是每一个项目所对应的设置项，我们主要设置图片的设置项，如图红色框出的内容，图片的质量我们可以设置成中或者低，然后像素/寸的数据我们可以设置的更小一点，最后确定，软件会自动优化压缩PDF文件。不过奇怪的是对有些文件这个方法很好用，能够减小蛮多的，但是有些文件优化后大小不变的或者变化很小很小。

对UNB的connectEd邮箱的手机配置

按照网页上的Android的手机的配置Android自带的Mail，是没有办法成功的；

今天使用了Android下面的一个免费开源的客户端：K-9 Mail，按照网页上配置Microsoft Outlook 2010的方式居然配置成功了，这里使用的是IMTP，而不是Exchange。