The Tesco Photo service is well worth investigating. It got a good review on Channel Five's Gadget Show recently (November 2009), for good service, quality and print price. One of the primary reasons it is worth looking at however, is that it offers unlimited storage space for your images, thereby providing a useful backup repository for your best images. It is free to use and all you have to do is register.
Below is a quick guide to signing up and using it.
Tesco Photo is online here.
One of the secondary bonuses at the moment is an offer of 40 free prints when you register.
Just use the 'Register here' link on the right of the web page (arrowed).
Registration is simple and just requires you to put in contact details (including your email address).
Step 2 - Register
Once registered, you are taken straight to the Welcome screen with a prominent link to start uploading photos.
The service is based on you creating 'albums' into which you load your images. This makes it easier for you to sort out your mages and share them with others. You can create albums for specific sets of pictures (i.e. taken on a holiday, like my NI 2009 one here - for images from a trip to Northern Ireland inApril 2009).
Note that you have some basic tools to rename, copy, move or delete images in albums but if your pictures require retouching etc. you should do that before uploading them.
Uploading uses a browser plugin tool specially for the service. I would recommend therefore that you use Internet Explorer when accessing the service as other browsers may struggle with the Active X plugin, which you have to agree to install.
Give it a short time to load and load into the browser. You will then be presented with a screen similar to Windows Explorer, where you navigate to your images on your PC (or USB stick). It shows small thumbnails of the images which you tick in a box on them to select and then download.
It all works well and with a decent broadband connection, it shouldn't take too long to upload them.
This is pretty simple too. you can share with any number of people, just by sending them an email, with a brief message.
The recipients will then be sent a link to your album. Be aware that they can view and order prints from your pictures themselves. There doesn't appear to be any mechanism at present to stop them doing this.
Tesco Photo has plenty of interesting photo services available online. Worth checking out to maybe make some unique and topical gifts for family and friends.
Other online services are available ;-)