No matter how smart you are, there’s always place for improvement. While the subject has been covered by LOTS of blogs, and although we really can’t add anything new, there’s always place for a quick “Best Tips” and “Best Resources” roundup list

Best Tips Roundup

1. Exercise - the Romans used to say “Mens sana in corpore sano” - Healthy mind in a healthy body - I really can’t comment enough on this one. Take long walks in the nature, pick up a favorite sport to practice, etc. It is the best way to boost one’s cerebral power.
2. Don’t eat junk - the less junk food, the more natural products - milk, vegetables, fish and fruit are known to help the organism and the brain especially. Oh, and creatine(found in red meat) seems to help a bit, too.
3. Don’t read junk - your attention and memory are of high value - don’t waste them reading daily news and celebrity gossip. Bring quality into your intellectual life and the results will follow Aim to read some classics instead - major poetry or novels you hated in your English class, major essays, history, art or science.
4. Be curious, Ask questions, Aim to answer - No, curiosity didn’t actually kill the cat. High IQ is in close correlation with high curiosity. Don’t be ashamed to ask questions, don’t be ashamed to search for answers on the web. Always aim to study some more, even if college ended years ago for you. Pick up new languages, new skills, new hobbies, or simply browse around Wikipedia and see what interesting things you can learn. Oh, yes, learning improves the IQ like nothing else.
5. Don’t panic. Relax. - breaks, relaxation and meditation are great for rebooting the brain. Have a problem you’re stuck with and don’t see the solution? Step back, change the context, think of something else. Most times the solution will come after a while, in a completely unrelated context.
6. Force the brain! Do things differently - use the computer mouse with the other hand, do stuff around the house with the eyes shut, switch hands in daily tasks, struggle to move muscles you didn’t know you had (who of the audience can move the smallest toe independent to the others?) - this will exercise unused parts of your brain and boost them.
7. Nothing is really forgotten - really now, memory is like an enormous hard-drive, it can store A LOT. What you have to do, however, is to defragment it once in a while and try to use some Google search spider on it. Namely, try to remember as many things as you can from as various contexts as possible. This will improve synapses and help you retrieve information in the future.
8. Sleep healthily - experiments on students have shown that being tired is like having a much lower IQ. So… don’t get too tired - sleep regularly and healthily

I could go on and on, but it’s better I point you to some other great articles on the subject:

Best Tips Links Roundup

1. Wikipedia’s entry on the IQ
2. NewScientist - 11 steps to a better brain
3. online free version of the cool How People Learn: Brain, Mind, Experience, and School: Expanded Edition book
4. Boost Your Brainpower! - Five ways to get your gray matter going.
5. How to Boost Your Brain Power
6. RirianProject - 22 ways to overclock your brain
7. NewScientist - meditation helps your brain
8. Solve Tough Problems with a Brain Reboot

What about getting smarter while procrastinating? The answer is simple - mind games. There’s a plethora of brain games out there that help you improve your attention, memory, cognitive and language skills and logical thinking. I’ll only list a couple of the most famous:

1. Lumosity Lumosity is the brain fitness program designed by neuroscientists that is scientifically demonstrated to improve your memory, attention and processing speed.
2. Crossword puzzles
3. Sudoku
4. IQ tests
5. Memory games - plenty of those around, I can’t really chose one link