Yes, I had those when I was a youngster too, in fact at that time I preferred them as the 1/32 Scalextric were pretty primitive back in those days whereas the Aurora AFX were superb, realistic looking and detailed in comparison. They also had 'magnatraction' which nobody else did at that time. Move on though and anything made in 1/32 for say the last 20 years has caught up and has both of those features and more.
I do still in fact have my original Aurora cars, albeit without the track which got lost over the years and during moves etc... In fact its that which re-awoke my interest in Scalextric some years back as I was browsing eBay for Aurora and found the new Scalextric models and well that's history. I have also bought some 1/64 scale models, but the original Aurora's are damn expensive here (always were) and even the Tomy AFX (they bought Aurora at some point) are quiite sought after. These days the modern equivalents are Scalextric Micro which are the same 1/64 scale and are compatible as are Aurora with Scalextric Micro track (which can be had for a song along with the cars). Unfortunately the majority of Scalextric Micro cars are not as detailed or realistic even now as the Aurora originally were which is a pity. It seems Scalextric/Hornby consider the Micro range is for kids and they make and sell them cheaply and put all their efforts into the 1/32 scale cars etc... believing that to be a more adult/serious market. Hence why the Micro are so cheap on the 2nd user market. Of course the other big player at least in the USA is AutoWorld who do a nice range of 1/64 which are primarily based on the same or very similar chassis as the original Aurora, even to the point of the metal skids as opposed to braids. They also do a nice range of HGV's (or rigs I think you guys call them). I got a few of those as I did originally have an Aurora one, although not sure exactly what happened to that - I suspect one of my brothers pinched it at some point.
There are some other 'unusual' releases from Scalextric, one is particularly interesting although its been out of production for some time now. That is based around 'Super Bikes', you know the high speed big motorcycles. The link below is to a set currently on sale on eBay, not necessarily the best example I've ever seen, but it gives you a clue to the flavour of the product. These are a bigger than 1/32 scale, but are designed to run on exactly the same track as the 1/32 scale cars. I suspect if you were inventive enough you could even make them 'digital' instead of analogue, but I've not seen anyone that's done it yet.
Scalextric Super Bikes set
Other oddities found in 1/64 scale include a Star Wars set which has an X-Fighter racing against a TIE Fighter, these like the speeder bikes that run on 1/32 are mounted on a motorised base, if I can find an online example I'll post it below. Similarly they did (and I find this really odd) a set consisting of a Velodrome circuit and a couple of guys on push bikes for the Olympic games we had here some years back, presumably because of how well we usually do on cycling. With these apparently the cyclist legs actually move as they travel round the track. I don't think it really caught on though as there's no expansion potential as a Velodrome circuit is simply a banked oval (bit like Nascar lol) and of course what point would there be having more cyclist models at best all you could do is change the colours of the outfits...
Scalextric Star Wars set
Scalextric Velodrome 2012 Olympics set
Just for good measure here's a link to one of the 1/32 track Star Wars Speeder Bike sets, this contains a Stormtrooper and (again) Luke Skywalker, gives you a look at how they look out of a box though and also shows you the base the speeders run on...
Star Wars Speeder Bike set
I wouldn't be surprised to see released soon a Captain Scarlet set perhaps for next Christmas with say the SPC (red Spectrum car) and another standard type futuristic car as the SPV & SPC models are due Q4 this year. This would then emulate the often seen Spectrum agents chasing a Mysteron agent as often featured in the Captain Scarlet show of the 60's/70's. Who knows maybe they will also do something along the lines of the 1/64 Star Wars set but with Spectrum 'Angels' fighter chasing a mysteron aircraft of some sort. Personally though if they are going to go making something unusual like the above based on Gerry Anderson works I'd like to see Stingray & one of the Atlantian TerrorFish submarines of maybe an interceptor vs UFO from the UFO series
Stingray
TerrorFish