After years of trying to find the end of the sellotape and cutting pieces off and sticking them on the table when wrapping a present. The large sellotape dispenser I bought about 15 years ago has to be up there as my favourite :-). Well used and reliable.
Maybe not a gadget as such, but about ten years ago I bought this set of mini screwdrivers from Poundland. I thought they would be rubbish but theyíre good quality and have been really useful over the years.
My Roomba is my favourite. Before I leave the house I just set it loose on one of the 4 floors and it does the business. I've got oak flooring on the 3 living floors and tiles in the cellar so I'm not sure how it would perform on carpet.