How to wind a good warp and get it on the loom without tension problems is something every new weaver needs to learn.
I use weights, as they are always around whereas I don't always have a friend handy to hold the warp for me. In some respects weights can work better, as a person has two hands and can hold up to two bundles of warp separately, but you can tie weights on every few inches of warp threads.
Here are my weights, attached to the chained warp. They are tied to hang slightly above floor level at the start.
I have tied them on with a medium weight linen warp yarn tied in a simple slip knot (or half hitch, depending how you look at it).
When I have wound on enough warp to raise the weights to table height, I stop and re-tie them.
Something I forgot to photograph is the warp winding on the beam with sheets of strong paper, wider than the weaving width, going under the warp threads as they wind on. On my larger looms I have wooden slats for the same purpose. These (paper, sticks, or some people use card) are very important to make sure the warp winds on evenly.
The path of the warp as I wind it on to this loom is over the top of the beater and though the shafts (not at this stage through the reed and heddles, I thread heddles and sley the reed last). On the left hand side you can see a green tie around the warp that I put on when it was on the warping board to keep the threads together, I'm just about to remove this tie.
At the back of the loom the threads are separated alternately over and under the lease sticks (they were prepared for this by making a "cross" on the warping board" and then they are spread out to the width of cloth I am going to weave by the raddle, which on this loom is a permanent feature of the back beam.
That's all for today, 15 mins are up and I will go over time now as I post this to the blog. I hope some new weavers will find this helpful.
EDIT 1st August 2012
...to add a link to Charlotte's blog Atellier Stellaria so you can see the ingenious 'Weaver's Friend' (besten Freund) invented by Andreas Moeller (see Charlotte's comment on this post).